Growth and cell cycle progress are diminished in bps1 leaves and roots. GUS stained tissue from bps1 and wild-type plants carrying CYCB1;1::GUS transgene. Top set: representative leaves, harvested at the same time daily (days three through seven). Bottom set: roots from the same time points. For both organs, severe effects on growth and development were obvious in bps1 by day four, and included dramatic reduction in the number of G2/M phase cells. Size bar = 0.1 mm (leaves), and 0.05 mm (roots).