Shown are 4pX-1 (A) and 4pX-1-gemininkd (D)
cells synchronized in G1/S by the double thymidine block,
immunostained for BrdUrd (BrdU) incorporation (green) and
phospho-H3 (red) in the indicated time course after release from the
block with (+) or without (-) pX expression. pX expression was initiated by
tetracycline removal 10 h before release from the second block and continued
for the indicated time course. BrdUrd was added 30 min before fixation.
B, confocal microscopy of BrdUrd-positive and phospho-H3-positive
cells from the 10.5-h time point with pX expression. C and
E, 4pX-1 (C) and 4pX-1-gemininkd (E)
cells, quantification of three independent experiments of BrdUrd-positive
(green) and phospho-H3-positive (red) cells by ImageJ
software, counting at least 1000 cells for each histogram.