Chains and heterogens:
PDB Chain Sequences:
>4y3gA (A:) stgsatttpidslddayitpvqigtpaqtlnldfdtgssdlwvfssettasevdgqtiyt psksttakllsgatwsisygdgssssgdvytdtvsvggltvtgqavesakkvsssfteds tidgllglafstlntvsptqqktffdnakasldspvftadlgyhapgtynfgfidttayt gsitytavstkqgfwewtstgyavgsgtfkstsidgiadtgttllylpatvvsaywaqvs gakssssvggyvfpcsatlpsftfgvgsarivipgdyidfgpistgssscfggiqssagi ginifgdvalkaafvvfngattptlgfask