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phentermine mastercard no rx To accomplish both studies, the team aligned 7,442 genes from the python and cobra with gene sequences available in the Ensembl Genome Browser from other amphibians, reptiles, bird and mammals. They analyzed the data using a statistical method called “branch site codon modeling” to look for genes that had been positively selected (or evolutionarily changed due to natural selection) in the python, the cobra, and early in snake evolution in the common ancestor of these two snakes. The data revealed changes in hundreds of genes.