Chains and heterogens:
PDB Chain Sequences:
>1s3kH (H:) evqlvesgggvvqpgrslrlscstsgftfsdyymywvrqapgkglewvaymsnvgaitdy pdtvkgrftisrdnskntlflqmdslrpedtgvyfcargtrdgswfaywgqgtpvtvssa stkgpsvfplapsskstsggtaalgclvkdyfpqpvtvswnsgaltsgvhtfpavlqssg lyslssvvtvpssslgtqtyicnvnhkpsntkvdkkvepksc
>1s3kH (H:) evqlvesgggvvqpgrslrlscstsgftfsdyymywvrqapgkglewvaymsnvgaitdy pdtvkgrftisrdnskntlflqmdslrpedtgvyfcargtrdgswfaywgqgtpvtvssa stkgpsvfplapgtaalgclvkdyfpqpvtvswnsgaltsgvhtfpavlqssglyslssv vtvpssslgtqtyicnvnhkpsntkvdkkvep
>1s3kL (L:) diqmtqspsslsasvgdrvtitcrssqrivhsngntylewyqqtpgkapklliykvsnrf sgvpsrfsgsgsgtdftftisslqpediatyycfqgshvpftfgqgtklqitrtvaapsv fifppsdeqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstysl sstltlskadyekhkvyacevthqglsspvtksfnrgec
>1s3kL (L:) diqmtqspsslsasvgdrvtitcrssqrivhsngntylewyqqtpgkapklliykvsnrf sgvpsrfsgsgsgtdftftisslqpediatyycfqgshvpftfgqgtklqitrtvaapsv fifppsdeqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstysl sstltlskadyekhkvyacevthqglsspvtksfnr