>d1aol__ b.20.1.1 (-) F-MuLV receptor-binding domain {Friend murine leukemia virus} qvynitwevtngdretvwaisgnhplwtwwpvltpdlcmlalsgpphwgleyqapysspp gppccsgssgssagcsrdcdepltsltprcntawnrlkldqvthkssegfyvcpgshrpr eakscggpdsfycaswgcettgrvywkpssswdyitvdnnlttsqavqvckdnkwcnpla iqftnagkqvtswttghywglrlyvsgrdpgltfgirlryqnlgprvp