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The Structure-Function Linkage Database (SFLD) is a hierarchical classification of enzymes that relates specific sequence-structure features to specific chemical capabilities. It was developed by the Babbitt Laboratory in collaboration with the UCSF Resource for Biocomputing, Visualization, and Informatics. As of April 2019, the database is in static format, and will not be updated. [from https://interpro-documentation.readthedocs.io/en/latest/sfld.html, accessed March 18th, 2026]

SEON provides a well-grounded network of software engineering reference ontologies, and mechanisms for deriving and incorporating new integrated domain ontologies into the network. [from homepage]

The Scientific Event Ontology (SEO) is a reference ontology for modeling data about scientific events such as conferences, symposioums, and workshops.

Identifier of an author or reviewer in the Semion database (now defunct)

The Semantic Mapping Vocabulary provides and defines terms used for creating and maintaining semantic mappings, in particular mapping metadata.

A vocabulary about species to support the environmental research community in Arizona and New Mexico

With the growing number of available genomes, the need for an environment to support effective comparative analysis increases. The original SEED Project was started in 2003 by the [Fellowship for Interpretation of Genomes (FIG)](http://thefig.info/) as a largely unfunded open source effort. Argonne National Laboratory and the University of Chicago joined the project, and now much of the activity occurs at those two institutions (as well as the University of Illinois at Urbana-Champaign, Hope college, San Diego State University, the Burnham Institute and a number of other institutions). The cooperative effort focuses on the development of the comparative genomics environment called the SEED and, more importantly, on the development of curated genomic data. This prefix provides identifiers for molecular roles that describe the function of one or more proteins in microbes and plants.

The Science Data Discovery Ontology (sddo) is being developed to provide a semantic foundation for the discovery of information managed by NASA's Science Mission Directorate. This information spans many scientific disciplines, fields and subfields, including heliophysics, earth science, planetary science, astrophysics, biology, astrobiology, and physical science. [from repository]

The SciCrunch Registry holds metadata records that describe digital resources, e.g., software, databases, projects and also services. Most of these are produced as a result of government funding and are available to the scientific community. Resources are manually curated to make sure the information is accurate. We also use a web crawler to find literature mentions for the resources.

Scopus is the largest abstract and citation database of peer-reviewed literature: scientific journals, books and conference proceedings. Delivering a comprehensive overview of the world's research output in the fields of science, technology, medicine, social sciences, and arts and humanities, Scopus features smart tools to track, analyze and visualize research.

A 7-character sid consists of "d" followed by the 4-character PDB ID of the file of origin, the PDB chain ID ('_' if none, '.' if multiple as is the case in genetic domains), and a single character (usually an integer) if needed to specify the domain uniquely ('_' if not). Sids are currently all lower case, even when the chain letter is upper case. Example sids include d4akea1, d9hvpa_, and d1cph.1.

This is a dot notation used to concisely describe a SCOP(e) class, fold, superfamily, and family. For example, a.39.1.1 references the 'Calbindin D9K' family, where 'a' represents the class, '39' represents the fold, '1' represents the superfamily, and the last '1' represents the family.

SCOP(e) unique identifier. This is simply a number that may be used to reference any entry in the SCOP(e) hierarchy, from root to leaves (Fold, Superfamily, Family, etc.).

A frontend to Wikidata

Schema.org is a collaborative, community activity with a mission to create, maintain, and promote schemas for structured data on the Internet, on web pages, in email messages, and beyond.

Selventa legacy chemical namespace used with the Biological Expression Language

SCancerRNA provides identifiers for non-coding RNA biomarkers, including long ncRNA, microRNA, PIWI-interacting RNA, small nucleolar RNA, and circular RNA, with data on their differential expression at the cellular level in cancer.