Chains and heterogens:
PDB Chain Sequences:
>1h4kX (X:) mddfaslplviepadlqarlsapelilvdltsaaryaeghipgarfvdpkrtqlgqppap glqppreqleslfgelghrpeavyvvyddegggwagrfiwlldvigqqryhylnggltaw laedrplsrelpapaggpvalslhdeptasrdyllgrlgaadlaiwdarspqeyrgekvl aakgghipgavnfewtaamdpsralrirtdiagrleelgitpdkeivthcqthhrsglty liakalgyprvkgyagswgewgnhpdtpvel