This family has a role in zymogen granule exocytosis [1-2].

1: Syncollin homo-oligomers associate with lipid bilayers in the form of doughnut-shaped structures. Geisse NA, Wasle B, Saslowsky DE, Henderson RM, Edwardson JM; J Membr Biol. 2002;189:83-92. PMID:12235484

2: Intragranular targeting of syncollin, but not a syncollinGFP chimera, inhibits regulated insulin exocytosis in pancreatic beta-cells. Hays LB, Wicksteed B, Wang Y, McCuaig JF, Philipson LH, Edwardson JM, Rhodes CJ; J Endocrinol. 2005;185:57-67. PMID:15817827