Enables protein tyrosine kinase activity. Predicted to be involved in several processes, including defense response to other organism; protein phosphorylation; and regulation of kinase activity. Predicted to act upstream of or within bone mineralization and skeletal system morphogenesis. Located in cytosol and plasma membrane. Orthologous to human FGR (FGR proto-oncogene, Src family tyrosine kinase). [provided by Alliance of Genome Resources, Apr 2022]