2073364 PNGase F peptide-N-glycosidase F 159 3860239 PNGase peptide:N-glycanase 77 2073370 PNGaseF peptide N-glycosidase F 12 3220610 PNGF peptide-N-glycosidase F 2 342292 PF peptide-N-glycosidase F 1