sentence: Of these subunits , several core members are present in most or all SWI / SNF complexes , including SMARCB1 ( also known as SNF5 , BAF47 and INI1 ) , SMARCC1 / SMARCC2 ( also known as BAF155 and BAF170 ) , and one of the two mutually exclusive ATPase subunits , SMARCA4 ( also known as BRG1 ) and SMARCA2 ( also known as BRM ) , which utilize energy derived from ATP hydrolysis to mobilize nucleosomes23 .