Enables heme binding activity; protein homodimerization activity; and protein kinase activity. Involved in negative regulation of cell population proliferation and negative regulation of hemoglobin biosynthetic process. Acts upstream of or within several processes, including macrophage differentiation; protoporphyrinogen IX metabolic process; and regulation of cellular macromolecule biosynthetic process. Located in cytoplasm. Is expressed in alimentary system; central nervous system; liver; nervous system; and spinal cord. Orthologous to human EIF2AK1 (eukaryotic translation initiation factor 2 alpha kinase 1). [provided by Alliance of Genome Resources, Apr 2022]