>3a50D (D:) observed residues (from ATOM records)
altttgteqhdlfsgtfwqnphpayaalraedpvrklalpdgpvwlltryadvreafvdp
rlskdwrhrlpedqradmpatptpmmilmdppdhtrlrklvgrsftvrrmnelepritei
adgllaglptdgpvdlmreyafqipvqvicellglpaedrddfsawssvlvddspaddkn
aamgklhgylsdllerkrtepddallssllavsdmdgdrlsqeelvamamllliaghett
vnligngvlallthpdqrkllaedpslissaveeflrfdspvsqapirftaedvtysgvt
ipagemvmlglaaanrdadwmpepdrlditrdasggvffghgihfclgaqlarlegrvai
grlfadrpelalavgldelvyrrstlvrglsrmpvtmgprs