National Library of Medicine | A Brief Guide to Finding and Comparing Ortholog Data at NCBI @NLMNIH | Uploaded September 2024 | Updated October 2024, 11 hours ago.
This is a detailed tutorial showing how to start with a human protein, find a set of Cetacean orthologs, align the protein sequences, and explore amino acids that are common within cetaceans, but different from those of the human sequence.

NIH Comparative Genomics Resource (CGR):
ncbi.nlm.nih.gov/datasets/cgr