b, Levels of CDC components (CPAP, Aurora A, OFD1, and Nde-1) are differentially regulated in response to serum starvation and stimulation in WT and Seckel fibroblasts. Specifically, they are elevated 1h after serum stimulation, thus enabling cilium disassembly. Elevated CDC levels in WT cells correlate with an elevated level of CPAP as shown in Fig. 2 as well as with the expression of cyclin A, a G1-S marker. GAPDH was used as a loading control indicating an equivalent amount of WT and Seckel fibroblast total proteins were loaded. 