Chains and heterogens:
PDB Chain Sequences:
>2a99A (A:) dpfagdpprhpglrvnsqkpfnaeppaellaerfltpnelfftrnhlpvpavepssyrlr vdgpgggtlslslaelrsrfpkhevtatlqcagnrrsemsrvrpvkglpwdigaistarw ggarlrdvllhagfpeelqgewhvcfegldadpggapygasipygralspaadvllayem ngtelprdhgfpvrvvvpgvvgarsvkwlrrvavspdespshwqqndykgfspcvdwdtv dyrtapaiqelpvqsavtqprpgaavppgeltvkgyawsgggrevvrvdvsldggrtwkv arlmgdkappgrawawalweltvpveagteleivckavdssynvqpdsvapiwnlrgvls tawhrvrvsvqd