Enables chromatin binding activity. Acts upstream of or within chromatin organization; glutathione metabolic process; and regulation of transcription by RNA polymerase II. Located in nucleoplasm. Is expressed in several structures, including 1st branchial arch; genitourinary system; gut gland; hemolymphoid system gland; and musculature. Orthologous to human HMGN5 (high mobility group nucleosome binding domain 5). [provided by Alliance of Genome Resources, Apr 2022]