Enables CCR5 chemokine receptor binding activity and growth hormone receptor binding activity. Predicted to be involved in several processes, including cell surface receptor signaling pathway; positive regulation of homotypic cell-cell adhesion; and positive regulation of sprouting angiogenesis. Predicted to act upstream of or within several processes, including cell surface receptor signaling pathway; cellular response to cytokine stimulus; and positive regulation of receptor signaling pathway via STAT. Predicted to be located in cytoplasm and nucleus. Biomarker of transient cerebral ischemia. Human ortholog(s) of this gene implicated in T-cell acute lymphoblastic leukemia; colorectal cancer; hepatocellular carcinoma; ovarian cancer; and pancreatic adenocarcinoma. Orthologous to human JAK1 (Janus kinase 1). [provided by Alliance of Genome Resources, Apr 2022]