This family includes the C-terminus of PTHB1 protein. This protein forms a part of the BBSome complex, which is required for ciliogenesis [1].

1: A core complex of BBS proteins cooperates with the GTPase Rab8 to promote ciliary membrane biogenesis. Nachury MV, Loktev AV, Zhang Q, Westlake CJ, Peranen J, Merdes A, Slusarski DC, Scheller RH, Bazan JF, Sheffield VC, Jackson PK; Cell. 2007;129:1201-1213. PMID:17574030