Dual fucci: a new transgenic line for studying the cell cycle from embryos to adults.

Bouldin et al. 1 described an improved version of the zebrafish Fucci system, which permits in vivo imaging of the cell cycle state using fluorescent proteins. Whereas the original system required crossing two different fish to produce embryos expressing both reporter transgenes, the new system, called Dual Fucci, expresses both reporters from a single transgene (Fig. 1), thus permitting crosses to other transgenic lines (e.g., reporter lines and heat-shock inducible lines). In addition, Editor’s Note