Regulatory subunit of the condensin-2 complex, a complex which establishes mitotic chromosome architecture and is involved in physical rigidity of the chromatid axis. Is required for early embryonic development and is essential for viability and expansion of the inner cell mass (ICM) of the implanting blastocyst. Component of the condensin-2 complex, which contains the SMC2 and SMC4 heterodimer, and 3 non SMC subunits that probably regulate the complex: NCAPH2, NCAPD3 and NCAPG2. Expressed in spleen, lung and testis as well as in hematopoietic cell lines. Expressed from 7 dpc when yolk sac hematopoiesis is initiated. Between 12.5 dpc and 15.5 dpc restricted to the developing fetal liver and the site of definitive hematopoiesis. Detected in thymus at 15.5 dpc as well as the midbrain, forebrain and the olfactory epithelium.