PCOTH GI:209447093 prostate collagen triple helix isoform 2 1 mlpeawssel tilsnlmgts eegnllstvs ptvkalfgkt rvspifpfsp 50 51 rspfqplipr tpgspwgpvg pasplgpgfp igpmgpgkpv gpkgpmlplg 100 101 psgpvgptsp lfpfcp