The Molecular Signatures Database (MSigDB) is a collection of annotated gene sets for use with GSEA software. From this web site, you can

Prefix
msigdb
Alternative Prefixes
msig
Links
Homepage
Contact
Missing Contact
Pattern for Local Unique Identifiers

Local identifiers in Molecular Signatures Database should match this regular expression:
^M\d+$

Example Local Unique Identifier
M1   Resolve
Pattern for CURIES

Compact URIs (CURIEs) constructed from Molecular Signatures Database should match this regular expression:
^msigdb:M\d+$

Example CURIE
msigdb:M1
Contributors
Metaregistry Molecular Signatures Database

The metaregistry provides mappings between the Bioregistry and other registries. There are 2 mappings to external registries for this resource with 2 unique external prefixes.

Registry Name Registry Metaprefix External Prefix Curate
Biolink Biolink Model Registry logo biolink MSigDB
Integbio Integbio logo integbio nbdc02550
Providers

Providers are various services that resolve CURIEs to URLs. The example CURIE msigdb:M1 is used to demonstrate the provides available for this resource. Generation of OLS and BioPortal URLs requires additional programmatic logic beyond string formatting.

Name Metaprefix URI
Molecular Signatures Database msigdb https://biopragmatics.github.io/providers/msigdb/M1
Bioregistry bioregistry https://bioregistry.io/msigdb:M1