Enables several functions, including bHLH transcription factor binding activity; histone deacetylase regulator activity; and transmembrane receptor protein tyrosine kinase inhibitor activity. Acts upstream of with a negative effect on transcription by RNA polymerase II. Acts upstream of or within erythrocyte differentiation and inner cell mass cell proliferation. Part of condensin complex. Is active in nucleus. Is expressed in several structures, including axial musculature; brain; hemolymphoid system; liver; and nasal cavity epithelium. Orthologous to human NCAPG2 (non-SMC condensin II complex subunit G2). [provided by Alliance of Genome Resources, Apr 2022]