>4jgs_F mol:protein length:105 MLV-related proviral Env polyproteinSSGLVGSGTALVATKQFEQLQAAIHTDLGALEKSVSALEKSLTSLSEVVLQNRRGLDLLFLKEGGLCAALKEECSFYADHTGVVRDSMAKLRERLNQRQRLFESG