>2vi4A (A:) observed residues (from ATOM records)
atfeivnrcsytvwaaaskgdaaldaggrqlnsgeswtinvepgtnggkiwartdcyfdd
sgsgicktgdcggllrckrfgrppttlaefslnqygkdyidisnikgfnvpmnfspttrg
crgvrcaadivgqcpaklkapgggcndactvfqtseyccttgkcgpteysrffkrlcpda
fsyvldkpttvtcpgssnyrvtfcpt