Chains and heterogens:
PDB Chain Sequences:
>1rxf_ (-) mdttvptfslaelqqglhqdefrrclrdkglfyltdcgltdtelksakdlvidffehgse aekravtspvptmrrgftglesestaqitntgsysdysmcysmgtadnlfpsgdferiwt qyfdrqytasravarevlratgtepdggveafldcepllrfryfpqvpehrsaeeqplrm aphydlsmvtliqqtpcangfvslqaevggaftdlpyrpdavlvfcgaiatlvtggqvka prhhvaaprrdqiagssrtssvfflrpnadftfsvplarecgfdvsldgetatfqdwigg nyvnirrtska
>1rxf_ (-) dttvptfslaelqqglhqdefrrclrdkglfyltdcgltdtelksakdlvidffehgsea ekravtspvptmrrgftgsmcysmgtadnlfpsgdferiwtqyfdrqytasravarevlr atgtepdggveafldcepllrfryfmaphydlsmvtliqqtpcagfvslqaevggaftdl pyrpdavlvfcgaiatlvtggqvkaprhhvaaprtssvfflrpnadftfsvplarecgfd vsldgetatfqdwiggnyvnirrt