MetaCyc
(https://metacyc.org) 📸 Data Snapshot: May 24, 2026
Semantic Coherence — The Lens
Pull the main entities out of the H1, then check whether they actually recur through the body. A page that announces one thing and then talks about another drifts. Headings with no real sentences underneath read as pseudo-substance.
Semantic Coherence
Homepage promise vs. Sub-page reality.
19
Impact Weight: 20 / 100
95% Reputation
There is almost no semantic drift between the homepage signal and the persistent navigation headers on sub-pages. While the sub-pages in the provided crawl returned ‘Not Found’ errors, the sidebar structure remains consistent with the scientific promise of the homepage, referencing Metabolism, Genome, and SmartTables. The homepage promise of an ‘Online encyclopedia of metabolism’ is directly supported by the extensive learning library and tutorial list.
Semantic Coherence is read from the heading hierarchy first: what each page announces in its H1 and headings, then whether the body actually delivers on it. Below is the structure the engine mapped, followed by the clean text to check for drift between promise and reality.
🏗️ Semantic Structure — heading hierarchy & page identity (the promise the page makes)
HOMEPAGE MetaCyc: Metabolic Pathways From all Domains of Life (https://metacyc.org)
Title
MetaCyc: Metabolic Pathways From all Domains of Life
Meta
MetaCyc is a highly curated metabolic database that contains metabolic pathways, enzymes, metabolites, and reactions from all domains of life.
H2 What people are saying…
H2 Learning Library
H3 Search
H3 Genome
H3 SmartTables
H3 Metabolism
H3 Analysis
H3 Ajmaline is an antiarrhythmic agent produced by the plant Rauvolfia serpentina. Why is it named after the Indian physician Hakim Ajmal Khan?
H3 Can the enzyme oxalate oxidase (EC 1.2.3.4) save the American chestnut? Yes, if you ask Darling 58.
H3 Saffron is arguably the most expensive spice in the world. But what does it have to do with Covid-19?
H3 The Bible tells us that the ancient Israelites were fed manna that fell from the sky while crossing the Sinai desert. But what is manna?
H3 Why did Cleopatra, the queen of Egypt, dilate her pupils to look larger? Well, we can't tell you why, but we can tell you how.
H3 Have you ever swum in the ocean and started to itch? Care to know why?
H3 Have you ever swum in the ocean and started to itch? Care to know why?
H3 How long can mammals live without oxygen? Find out!
H3 Vanillin goes with desserts. Chilli peppers go with salsa. But you can't have salsa without vanillin.
H3 Chitin is the second most common polymer in the world, after cellulose. Our understanding of its degradation was significantly boosted with the discovery of LPMOs. And what are LPMOs?
H3 What do bile acids have to do with a bear? And why you should be aware?
H3 Tutorial Videos
H3 Select One or More Databases:
H3 Filter organisms by first letter
H3 Current Selection
H4 General Information
H4 Data and Services
H4 Credits
H4 Follow Us
NAV_HEADER_HEADING_REPEATED Not Found (https://metacyc.org/[ORGID]/select-gen-el/)
Title
Not Found
H3 Search
H3 Genome
H3 SmartTables
H3 Metabolism
H3 Analysis
H3 Select One or More Databases:
H3 Filter organisms by first letter
H3 Current Selection
H4 General Information
H4 Data and Services
H4 Credits
H4 Follow Us
HEADER_HEADING_REPEATED Not Found (https://metacyc.org/[ORGID]/class-tree/)
Title
Not Found
H3 Search
H3 Genome
H3 SmartTables
H3 Metabolism
H3 Analysis
H3 Select One or More Databases:
H3 Filter organisms by first letter
H3 Current Selection
H4 General Information
H4 Data and Services
H4 Credits
H4 Follow Us
HEADER_HEADING_REPEATED_BODY Not Found (https://metacyc.org/smarttables/)
Title
Not Found
H3 Search
H3 Genome
H3 SmartTables
H3 Metabolism
H3 Analysis
H3 Select One or More Databases:
H3 Filter organisms by first letter
H3 Current Selection
H4 General Information
H4 Data and Services
H4 Credits
H4 Follow Us
📝 The Narrative — clean text per page (homepage promise vs. sub-page reality)
HOMEPAGE (https://metacyc.org) MetaCyc: Metabolic Pathways From all Domains of Life
[IMG: MetaCyc] [H3] [H3] Ajmaline is an antiarrhythmic agent produced by the plant Rauvolfia serpentina. Why is it named after the Indian physician Hakim Ajmal Khan? Learn More [IMG: Rauvolfia serpentina, a plant with red stems and blue-black berries] A cropped version of the image Chandra by Dinesh Valke. Used under creative commons license. [H3] Can the enzyme oxalate oxidase (EC 1.2.3.4) save the American chestnut? Yes, if you ask Darling 58. Learn More [IMG: Green spiky chestnut pods grow on a chestnut tree] Chestnuts by Peter Burka. Used under creative commons license. [H3] Saffron is arguably the most expensive spice in the world. But what does it have to do with Covid-19? Learn More [IMG: Purple saffron flowers] Autumn crocus! by Sylvia Sassen. Used under creative commons license. [H3] [H3] The Bible tells us that the ancient Israelites were fed manna that fell from the sky while crossing the Sinai desert. But what is manna? Learn More [IMG: black and white photo of people walking in the Sinai desert] Exodus by Giorgio Raffaelli. Used under creative commons license. [H3] [H3] Why did Cleopatra, the queen of Egypt, dilate her pupils to look larger? Well, we can't tell you why, but we can tell you how. Learn More [IMG: Cleopatra holding black cat Bastet] Granted Audience with Cleopatra and Bastet by Stella Splendid. Used under Creative Commons license. [H3] Have you ever swum in the ocean and started to itch? Care to know why? Learn More [IMG: Man lying on surfboard in the ocean] Coral Reef, taken by Susan Hazlett, USGS. Public domain. [H3] [H3] How long can mammals live without oxygen? Find out! Learn More [IMG: Whimsical drawing of a naked mole rat] IMG_20161015_161456 by Julie Freeman. Used under Creative Commons license [H3] [H3] Vanillin goes with desserts. Chilli peppers go with salsa. But you can't have salsa without vanillin. Learn More [IMG: row of chili peppers] Chili pepper by hepp. Used under creative commons license [H3] [H3] Chitin is the second most common polymer in the world, after cellulose. Our understanding of its degradation was significantly boosted with the discovery of LPMOs. And what are LPMOs? Learn More [IMG: Irridescent blue beetle on a twig] Empty? by Arkadiusz R. Used under creative common license [H3] [H3] What do bile acids have to do with a bear? And why you should be aware? Learn More [IMG: Polar bear in water] Polar bear by Leszek.Leszczynski. Used under creative commons license. [H1] MetaCyc Metabolic Pathway Database MetaCyc is a curated database of experimentally elucidated metabolic pathways from all domains of life. MetaCyc contains pathways involved in both primary and secondary metabolism, as well as associated metabolites, reactions, enzymes, and genes. The goal of MetaCyc is to catalog the universe of metabolism by storing a representative sample of each experimentally elucidated pathway. MetaCyc currently contains 3,284 pathways, 20,199 reactions, and 20,642 metabolites. MetaCyc applications include: Online encyclopedia of metabolism Predict metabolic pathways in sequenced genomes Support metabolic engineering via enzyme database Metabolite database aids metabolomics research Guide To MetaCyc Try Free Request Free Classroom Use [H2] What people are saying... "BsubCyc is a tool of the utmost value." [IMG: Penn State] Paul BabitzkeProf. of Biochemistry& Molecular Biology "My lab uses these resources on a daily basis." [IMG: University of Wisconsin] Patricia Kiley,Professor and Chair,Dep't. of Biomolecular Chemistry "We rely on BioCyc's Gene Pages and Overview Diagrams almost daily." [IMG: University of Minnesota] Arkady KhodurskyAssoc. Prof. Biochemistry "We use BioCyc and MetaCyc extensively to investigate the metabolic and regulatory processes of organisms we study." [IMG: Pacific Northwest National Lab] William Cannon, Team LeadComputational Biology "BioCyc is the go-to resource of knowledge and tools for Ginkgo scientists." [IMG: Ginkgo Bioworks] "BioCyc is a tremendous resource for pathway analysis in metabolomics." [IMG: University of Georgia] Art Edison, Dept of Genetics "We make extensive use of the BioCyc full metabolic network diagram for omics data analysis." [IMG: Great Lakes Bioenergy] Timothy J. Donohue, Director "I have not found another database that has a better interface than BioCyc." [IMG: University of Michigan] Gary B. Huffnagle, ProfessorMicrobiology and Immunology See more BioCyc testimonials [H2] Learning Library [H3] Tutorial Videos Tutorial #1: Introduction to BioCyc Quick Introduction to BioCyc (4:30) Searching in BioCyc (17:00) Genes (15:00) Genome Browser (11:45) Pathways (13:19) Reactions (3:37) Compounds (6:42) Tutorial #2: Introduction to SmartTables The following Tutorial will guide you through SmartTables, which enable you to create, upload, share, and analyze sets of genes, metabolites, pathways, and sequence sites. The Tutorial is broken up into parts, ranging from basic operations to more advanced uses such as gene expression analysis and metabolomics. SmartTables Overview (4:30) SmartTables Basics (12:43) SmartTables Transformations (8:08) SmartTables Import and Export (9:00) SmartTables Gene Expression Analysis (7:40) Metabolomics Analysis with SmartTables (6:45) Tutorial #3: Zoomable Metabolic Map, Comparative Tools, Regulatory Network This tutorial introduces users to many of the advanced tools available on the BioCyc.org website for navigating cellular networks, analyzing large-scale datasets, and comparing organisms. The Cellular Overview: Navigating metabolic networks (17:15) Comparative Genomics (21:06) Ortholog Viewing (10:02) The Regulatory Overview -- exploring transcriptional regulatory networks (15:21) Tutorial #4: Omics Data Analysis This tutorial will show you how to use BioCyc's tools for omics data analysis, including the cellular omics viewer, the omics dashboard, and other tools. Transcriptomics Analysis Tools [brief tour (2:40) Metabolomics Analysis Tools (3:26) [click here for a detailed tutorial] Omics Dashboard (16:35) Omics Dashboard Part (24:29) Tutorial #5: Pathway Collages Pathway collages are multi-pathway diagrams that you can customize by, for example, overlaying omics data, altering the relative positions of pathways, and modifying connections among pathways. Learn how to generate, customize and export high-quality pathway-collage diagrams showing collections of user-specified pathways. Pathway Collages (22:39) Tutorial #6: Creating a Pathway/Genome Database Learn the entire process of building a BioCyc-like Pathway/Genome Database (PGDB) for an organism with a sequenced and annotated genome. Build a PGDB for your own lab or for the whole scientific community. Part 1A: Introduction to Database Building and Pathologic (14:04) Part 1B: Building a Database: Detailed Pathologic Example (23:53) Part 2A: General Editing Strategies (8:00) Part 2B: Creating and Editing Reactions and Compounds (17:32) Part 2C: Updating Proteins, Citations, GO Terms, and Enzymatic Reactions (26:10) Part 2D: Making and Editing Pathways (9:42) Tutorial #7: Using the Structured Advanced Query Page An introduction to the Structured Advanced Query Page, which allows complex queries and queries across one or more databases in the BioCyc collection. You'll learn about:The basic steps of setting up an advanced query; Four examples of increasingly complex queries, including how to query across multiple databases; Where to learn more about the structure of BioCyc databases. Structured Advanced Query Page Quick Introduction (6:27) Structured Advanced Query Page Full Tutorial (42:15)
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SUB-PAGE · THIN (https://metacyc.org/[ORGID]/select-gen-el/) Not Found
Not FoundThe server doesn't know how to respond to http://metacyc.org/%5BORGID%5D/select-gen-el/. Please make sure you have the correct URL.Host: biocyc16Report Errors or Provide Feedback Page generated by Pathway Tools version 29.5 (software by SRI International) on Sun May 24, 2026, BIOCYC16.EcoCyc version 29.6.
315 chars
SUB-PAGE · THIN (https://metacyc.org/[ORGID]/class-tree/) Not Found
Not FoundThe server doesn't know how to respond to http://metacyc.org/%5BORGID%5D/class-tree/. Please make sure you have the correct URL.Host: biocyc16Report Errors or Provide Feedback Page generated by Pathway Tools version 29.5 (software by SRI International) on Sun May 24, 2026, BIOCYC16.EcoCyc version 29.6.
312 chars
SUB-PAGE · THIN (https://metacyc.org/smarttables/) Not Found
Not FoundThe server doesn't know how to respond to http://metacyc.org/smarttables/. Please make sure you have the correct URL.Host: biocyc16Report Errors or Provide Feedback Page generated by Pathway Tools version 29.5 (software by SRI International) on Sun May 24, 2026, BIOCYC16.EcoCyc version 29.6.
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Explore the other reputation pillars for MetaCyc
Analysis Disclosure & Source Attribution
This page presents a snapshot of public data from MetaCyc, captured on May 24, 2026, to show how machine logic reads Semantic Coherence signals into an AI reputation evaluation.
Purpose: This data is presented under “Fair Use” for the purpose of independent signal analysis, allowing readers to see the raw signals behind the reputation score.
Notice to MetaCyc: This analysis is part of a non-adversarial audit conducted by 1 Euro SEO. The results are intended as professional feedback to help improve any website’s machine-readability and authority signals. The evaluation is free, and any company can request a fresh audit at any time.
Any company can use the insights for free and improve its voice. When a company has updated its content, it can always submit a new audit request, which will be reflected in a new current score.
To all users: You are encouraged to visit the live site at https://metacyc.org to view the most current version of its content and see directly what this company is about and what it offers.