Chains and heterogens:
PDB Chain Sequences:
>2ac4A (A:) srkkmgllvmaygtpykeedieryythirrgrkpepemlqdlkdryeaiggisplaqite qqahnleqhlneiqdeitfkayiglkhiepfiedavaemhkdgiteavsivlaphfstfs vqsynkrakeeaeklggltitsveswydepkfvtywvdrvketyasmpederenamlivs acslpekikefgdpypdqlhesakliaegagvseyavgwqsegntpdpwlgpdvqdltrd lfeqkgyqafvyvpvgfvadhlevlydndyeckvvtddigasyyrpempnakpefidala tvvlkklgr