The scavenger receptor cysteine-rich (SRCR) superfamily is
an ancient and highly conserved group of cell surface and/or
secreted proteins, some of which are involved in the development of
the immune system and the regulation of both innate and adaptive
immune responses. Group B SRCR domains usually contain 8 regularly
spaced cysteines that give rise to a well-defined intradomain
disulfide-bond pattern.
