Chains and heterogens:
PDB Chain Sequences:
>1iku_ (-) gnsksgalskeileelqlntkfteeelsswyqsflkecpsgritrqefqtiyskffpead pkayaqhvfrsfdansdgtldfkeyvialhmtsagktnqklewafslydvdgngtiskne vleivtaifkmispedtkhlpedentpekraekiwgffgkkdddkltekefiegtlanke ilrliqfe