Chains and heterogens:
PDB Chain Sequences:
>1p99A (A:) mghhhhhhdydipttenlyfqgahmgiqrptstgsnndkkvtigvasndtkawekvkela kkddidveikhfsdynlpnkalndgdidmnafqhfafldqykkahkgtkisalsttvlap lgiysdkikdvkkvkdgakvvipndvsnqaralklleaagliklkkdfglagtvkditsn pkhlkitavdaqqtaralsdvdiavinngvatkagkdpkndpifleksnsdavkpyiniv avndkdldnktyakivelyhskeaqkalqedvkdgekpvnlskdeikaietslak
>1p99A (A:) kvtigvasndtkawekvkelakkddidveikhfsdynlpnkalndgdidmnafqhfafld qykkahkgtkisalsttvlaplgiysdkikdvkkvkdgakvvipndvsnqaralklleaa gliklkkdfglagtvkditsnpkhlkitavdaqqtaralsdvdiavinngvatkagkdpk ndpifleksnsdavkpyinivavndkdldnktyakivelyhskeaqkalqedvkdgekpv nlskdeikaietsla