>4y50A (A:) SEQRES residues
stgsatttpidslddayitpvqigtpaqtlnldfdtgssdlwvfssettasevdgqtiyt
psksttakllsgatwsisygdgssssgdvytdtvsvggltvtgqavesakkvsssfteds
tidgllglafstlntvsptqqktffdnakasldspvftadlgyhapgtynfgfidttayt
gsitytavstkqgfwewtstgyavgsgtfkstsidgiadtgttllylpatvvsaywaqvs
gakssssvggyvfpcsatlpsftfgvgsarivipgdyidfgpistgssscfggiqssagi
ginifgdvalkaafvvfngattptlgfask