Lys-Asn-Arg-Trp-Glu-Asp-Pro-Gly-Lys-Gln-Leu-Tyr-Asn-Val-Glu-Ala; KNRWEDPGKQLYNVEA; CPAMD1; Complement C3, C3 and PZP-like alpha-2-macroglobulin domain-containing protein 1; Complement C3 beta chain, C3-beta-c, C3bc, Complement C3 alpha chain;C3a anaphylatoxin; Acylation stimulating protein; ASP; C3adesArg; Complement C3b alpha' chain; Complement C3c alpha' chain fragment 1; Complement C3dg fragment; Complement C3g fragment;Complement C3d fragment; Complement C3f fragment; Complement C3c alpha' chain fragment 2, C3

P16, a 16-amino acid peptide sequence of human C3d, regulated in vitro and in vivo tyrosine phosphorylations of the pp100 and pp105 and in vitro proliferation of human B lymphocytes, depending on the stage of cell differentiation.