Post translational modifications are covalent changes made to proteins. This includes phosphorylation, protein cleavage, glycosylation, and lipidation as well as others. These alterations can activate or deactivate certain functions of proteins. PTK7 is a kinase, which are enzymes involved with phosphorylation modifications.
The above graphs are predictions of phosphorylation sites created by NetPhos. The left graph is the human ptk7 gene, and the right graph is the zebrafish gene.
Conclusion
According to NetPhos, predicted phosphorylation sites in the ptk7 gene seem to be relatively similar between humans and zebrafish, which is further proof that the ptk7 gene likely has comparable functions in humans and zebrafish.