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Amino acid sequence of the ecotropic Mo-MuLV membrane-spanning domain and surrounding residues of TM compared with that of other murine, feline, and gibbon ape leukemia viruses (GeneBank accession numbers 74692, M33469, K02730, 74707, 74702, and M26927, respectively). The absolutely conserved residues in the putative membrane-spanning domain are represented by the bold type, whereas the specific residues that were mutated are indicated by an asterisk.
