WFDC5 GI:21717822 WAP four-disulfide core domain 5 precursor 1 mrtqsllllg allavgsqlp avfgrkkgek sggcppddgp cllsvpdqcv 50 51 edsqcpltrk ccyracfrqc vprvsvklgs cpedqlrcls pmnhlchkds 100 101 dcsgkkrcch sacgrdcrdp arg