WFDC12 GI:20069858 WAP four-disulfide core domain 12 precursor 1 mgsssflvlm vslvlvtlva vegvkegiek agvcpadnvr cfksdppqch 50 51 tdqdclgerk ccylhcgfkc vipvkeleeg gnkdedvsrp ypepgweakc 100 101 pgssstrcpq k