Chains and heterogens:
PDB Chain Sequences:
>2cna_ (-) adtivaveldtypntdigdpsyphigidiksvrskktakwnmqdgkvgtahiiynsvdkr lsavvsypnadatsvsydvdlndvlpewvrvglsastglyketntilswsftsklksnst hqtdalhfmfnqfskdqkdlilqgdattgtdgnleltrvssngspegssvgralfyapvh iwessatvsafeatfaflikspdshpadgiaffisnidssipsgstgrllglfpdan