Chains and heterogens:
PDB Chain Sequences:
>1g66A (A:) scpaihvfgarettaspgygssstvvngvlsaypgstaeainypacggqsscggasysss vaqgiaavasavnsfnsqcpstkivlvgysqggeimdvalcgggdpnqgytntavqlsss avnmvkaaifmgdpmfraglsyevgtcaaggfdqrpagfscpsaakiksycdasdpyccn gsnaathqgygseygsqalafvksklg