Enables non-membrane spanning protein tyrosine kinase activity. Involved in positive regulation of cell population proliferation; positive regulation of ubiquitin-dependent protein catabolic process; and protein phosphorylation. Acts upstream of or within several processes, including blood vessel morphogenesis; generation of neurons; and peptidyl-tyrosine autophosphorylation. Located in several cellular components, including apical plasma membrane; focal adhesion; and lamellipodium. Is expressed in several structures, including alimentary system; central nervous system; eye; genitourinary system; and yolk sac. Human ortholog(s) of this gene implicated in leiomyoma; lung small cell carcinoma; and pulmonary hypertension. Orthologous to human PTK2 (protein tyrosine kinase 2). [provided by Alliance of Genome Resources, Apr 2022]