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Reference

Evidence

CompoundsSubstances with curated findings
OutcomesMeasured endpoints
ProteinsTransporters and enzymes
InteractionsPairs that share biology
PapersEvery paper a finding cites
ArticlesReadings of the evidence

Chemistry

ReactionsRhea and Human-GEM, by subsystem
ReachWhat a compound can become

Reference layer

PathwaysReactions grouped under one name
ProcessesWhat proteins are annotated as doing
AnatomyTissues, by what is expressed there
Cell typesCells, by what is expressed there
OrganismsSpecies a compound is prepared from
MaterialsSubstances that are not one molecule
AssessmentsRegulatory determinations, transcribed
DiseasesFeatures, genes, and where each sits

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Reference

Evidence

Compounds
Outcomes
Proteins
Interactions
Papers
Articles

Chemistry

Reactions
Reach

Reference layer

Pathways
Processes
Anatomy
Cell types
Organisms
Materials
Assessments
Diseases

Atlas Graph Twin Access

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Catalyst

Computational infrastructure for human biology, built on a provenance-aware knowledge graph. Findings retain their sources; research and simulation are the next layers.

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A reference for what the literature reports. Not medical advice.

© 2026 CatalystPrivacy TermsReference data under the licences listed on the attribution page.

Reaction

serotonin+3'-phosphoadenylyl sulfateserotonin O-sulfate+adenosine 3',5'-bisphosphate+hydron

Left to right · Balanced

Inferred

Reference data, not a finding. Evidence key

Catalysts

SULT1A3
SULT1A4

Kinetics

Km 71.38 µM · serotonin · SULT1A4
Measured · human enzyme; other conditions not stated
UniProt P0DMN0 · 2026_03 · CC BY 4.0 · paper cited by UniProt PMID 29524394
Km 71.38 µM · serotonin · SULT1A3
Measured · human enzyme; other conditions not stated
UniProt P0DMM9 · 2026_03 · CC BY 4.0 · paper cited by UniProt PMID 29524394

Rhea RHEA:83339·2026-08-19·CC BY 4.0Reference data