Chains and heterogens:
PDB Chain Sequences:
>1k6iA (A:) maqqkktiavvnatgrqaaslirvaaavghhvraqvhslkgliaeelqaipnvtlfqgpl lnnvplmdtlfegahlafinttsqagdeiaigkdladaakragtiqhyiyssmpdhslyg pwpavpmwapkftvenyvrqlglpstfvyagiynnnftslpyplfqmelmpdgtfewhap fdpdiplpwldaehdvgpallqifkdgpqkwnghrialtfetlspvqvcaafsralnrrv tyvqvpkveikvnipvgyreqleaievvfgehkapyfplpefsrpaagspkglgpangkg agagmmqgpggvisqrvtdearklwsgwrdmeeyarevfpieeeangldwml
>1k6iA (A:) qqkktiavvnatgrqaaslirvaaavghhvraqvhslkgliaeelqaipnvtlfqgplln nvplmdtlfegahlafinttsqagdeiaigkdladaakragtiqhyiyssmpdhslygpw pavpmwapkftvenyvrqlglpstfvyagiynnnftslpyplfqmelmpdgtfewhapfd pdiplpwldaehdvgpallqifkdgpqkwnghrialtfetlspvqvcaafsralnrrvty vqvpkveikvnipvgyreqleaievvfgehkapyfplpefsrvtdearklwsgwrdmeey arevfpieeeangldwml