Chains and heterogens:
PDB Chain Sequences:
>4b99A (A:) smaeplkeedgedgsaeppgpvkaepahtaasvaaknlallkarsfdvtfdvgdeyeiie tigngaygvvssarrrltgqqvaikkipnafdvvtnakrtlrelkilkhfkhdniiaikd ilrptvpygefksvyvvldlmesdlhqiihssqpltlehvryflyqllrglkymhsaqvi hrdlkpsnllvnencelkigdfgmarglctspaehqyfmteyvatrwyrapelmlslhey tqaidlwsvgcifgemlarrqlfpgknyvhqlqlimmvlgtpspaviqavgaervrayiq slpprqpvpwetvypgadrqalsllgrmlrfepsarisaaaalrhpflakyhdpddepdc appfdfafdrealtrerikeaivaeiedfharregirq
>4b99A (A:) vtfdvgdeyeiietigngaygvvssarrrltgqqvaikkipnafdvvtnakrtlrelkil khfkhdniiaikdilrptvpygefksvyvvldlmesdlhqiihssqpltlehvryflyql lrglkymhsaqvihrdlkpsnllvnencelkigdfgmarglqyfmteyvatrwyrapelm lslheytqaidlwsvgcifgemlarrqlfpgknyvhqlqlimmvlgtpspaviqrvrayi qslpprqpvpwetvypgadrqalsllgrmlrfepsarisaaaalrhpflakyhdpddepd cappfdfafdrealtrerikeaivaeiedfharre