When looking at the SBPM proteins, they have high similarity between different subspecies of the Crotalus genus and between different individuals of the same subspecies. This indicates, according to the Radis-Batista et al. 2003 study, that the crotamine gene and other SBPM genes have evolved recently.
This finding indicates that the crotamine gene and other SBPM genes have undergone significant changes in a relatively short period, according to Radis-Batista et al.'s 2003 research, which highlights the importance of recent evolution in shaping these proteins.