Condensins I and II share the same pair of core subunits, SMC2 and SMC4, both belonging to a large family of chromosomal ATPases, known as SMC proteins (SMC stands for Structural Maintenance of Chromosomes).
As condensinas I e II comparten o mesmo par de subunidades centrais ou core, SMC2 e SMC4, que pertencen ambas á gran familia das ATPases cromosómicas chamadas proteínas SMC (SMC significa Structural Maintenance of Chromosomes, Mantemento estrutural dos cromosomas).