>1op3K (K:) observed residues (from ATOM records)
vvmtqspstlsasvgdtititcrasqsietwlawyqqkpgkapklliykastlktgvpsr
fsgsgsgteftltisglqfddfatyhcqhyagysatfgqgtrveikrtvaapsvfifpps
deqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstyslsstltl
skadyekhkvyacevthqglsspvtksfnrg