The mouse IgG1 analogue is a tetrapeptide Thr-Gln-Pro-Arg (TQPR) at the same place, one base change at the first base of the triplet code.
The mouse IgG1 analog is a four-amino acid sequence, Thr-Gln-Pro-Arg (TQPR), located at the same site, with only one base alteration in the first codon of the triplet code.