Chains and heterogens:
PDB Chain Sequences:
>1sm3H (H:) qvqlqesggglvqpggsmklscvasgftfsnywmnwvrqspekglewvaeirlksnnyat hyaesvkgrftisrddskssvylqmnnlraedtgiyyctgvgqfaywgqgttvtvssakt tpptvyplapgsnaasqsmvtlgclvkgyfpepvtvtwnsgslasgvhtfpavlqsdlyt lsssvtvpsstwpsetvtcnvahpasstkvdakivpr
>1sm3H (H:) qvqlqesggglvqpggsmklscvasgftfsnywmnwvrqspekglewvaeirlksnnyat hyaesvkgrftisrddskssvylqmnnlraedtgiyyctgvgqfaywgqgttvtvssakt tpptvyplapgsmvtlgclvkgyfpepvtvtwnsgslasgvhtfpavlqsdlytlsssvt vpsstwpsetvtcnvahpasstkvdakivpr
>1sm3L (L:) ivvtqesalttspgetvtltcrsstgavttsnyanwvqekpdhlftgliggtnnrapgvp arfsgsligdkaaltitgaqtedeaiyfcalwysnhwvfgggtkltvlgseksspsvtlf ppsseeletnkatlvctitdfypgvvtvdwkvdgtpvtqgmettqpskqsnnkymassyl tltarawerhssyscqvtheghtvekslsr