Chains and heterogens:
PDB Chain Sequences:
>2xknA (A:) diqmtqttsslsaslgdrvtiscrasqdisnylnwyqqkpdgtvklliyytsrlhsgvts rfsgsgsgtdysltisnleqediatyfcqqgntlpwtfgggtkveikradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrnecevmlvesgg
>2xknA (A:) diqmtqttsslsaslgdrvtiscrasqdisnylnwyqqkpdgtvklliyytsrlhsgvts rfsgsgsgtdysltisnleqediatyfcqqgntlpwtfgggtkveikradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrne
>2xknB (B:) evmlvesggvlvkpggslklscaasgftfsryamswvrqtpekrlewvatissggsysyy pdsvkgrftisrdnvkntlylqmsslrsedtamyycardsggfaywgqgtlvtvsaaktt ppsvyplapvcgdttgssvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytl sssvtvpsstwpsqsvtcnvahpasstkvdkkiepr
>2xknB (B:) evmlvesggvlvkpggslklscaasgftfsryamswvrqtpekrlewvatissggsysyy pdsvkgrftisrdnvkntlylqmsslrsedtamyycardsggfaywgqgtlvtvsaaktt ppsvyplapgssvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytlsssvtv psstwpsqsvtcnvahpasstkvdkkiep
>2xknC (C:) diqmtqttsslsaslgdrvtiscrasqdisnylnwyqqkpdgtvklliyytsrlhsgvts rfsgsgsgtdysltisnleqediatyfcqqgntlpwtfgggtkveikradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrnecevmlvesgg
>2xknC (C:) diqmtqttsslsaslgdrvtiscrasqdisnylnwyqqkpdgtvklliyytsrlhsgvts rfsgsgsgtdysltisnleqediatyfcqqgntlpwtfgggtkveikradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrne
>2xknD (D:) evmlvesggvlvkpggslklscaasgftfsryamswvrqtpekrlewvatissggsysyy pdsvkgrftisrdnvkntlylqmsslrsedtamyycardsggfaywgqgtlvtvsaaktt ppsvyplapvcgdttgssvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytl sssvtvpsstwpsqsvtcnvahpasstkvdkkiepr
>2xknD (D:) evmlvesggvlvkpggslklscaasgftfsryamswvrqtpekrlewvatissggsysyy pdsvkgrftisrdnvkntlylqmsslrsedtamyycardsggfaywgqgtlvtvsaaktt ppsvyplapttgssvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdlytlsssv tvpsstwpsqsvtcnvahpasstkvdkkiep