Dictionary of Protein Sites and Patterns
Release 2020_03, Jun 20
Swiss Institute of Bioinformatics
2,590 entries

Protein families database of alignments and HMMs
Release 33.1, May 20
The Pfam Consortium
18,102 entries

NCBI Conserved Domain Database
Release 3.18, Apr 20
National Center for Biotechnology Information
55,426 entries