Crystal structure of the HDV ribozyme precursor RNA. RNA preceding the cleavage site is indicated in green.

Photo courtesy of Professor Jennifer Doudna.

Bone marrow cells were stained with an antibody specific for the pan-B cell marker B220 and analyzed for GFP expression.

Photo courtesy of Professor Mark Schlissel.

Wild-type maize meiocyte at late pachytene.

Photo courtesy of Professor W. Zacheus Cande.

Ribbon diagram of a three-dimensional model of the structure of S. cerevisiae Cdc42.

Photo courtesy of Professor Jeremy Thorner.