FIG. 2.

Nucleotide and deduced amino acid sequence variations in the mid-pol region of FeLV clones. The indicated sequences, residing within the RT gene, are presented in reference to AKV MuLV sequence (17). The single-letter designation for the amino acid sequence is shown above the nucleotide sequence. Identity to the MuLV sequence is indicated by dots, and amino acid changes are shown in boldface type. To maintain sequence alignment, gaps were introduced into the F6A sequence (indicated by dashes). The number at the top left corner of each sequence indicates the position of the starting nucleotide corresponding to GenBank accession no. J01998 (for AKV MuLV), L06140 (for enFeLV, CFE-6), AF052723 (for FRA), and M18247 (for F6A).