(A) Expression of condensin I subunits in insect cells. The wild-type (WT) or IV-5Q mutant CAP-H subunit was co-expressed with the other four subunits (GST-SMC4, SMC2, CAP-D2 and CAP-G) in insect cells. Cell lysates were prepared and subjected to SDS-PAGE, followed by immunoblotting with a mixture of antibodies against SMC2 and SMC4 (left panel) or against CAP-D2, -G, and -H (right panel). 