cl21584: Tryp_SPc Superfamily (this model, PSSM-Id:419748 is obsolete and has been replaced by 473915)
Trypsin-like serine protease; Many of these are synthesized as inactive precursor zymogens that are cleaved during limited proteolysis to generate their active forms. Alignment contains also inactive enzymes that have substitutions of the catalytic triad residues.
Jiyao W et al.(2023). "The conserved domain database in 2023.",