T-ALLs from CG1 fish are capable of engraftment into CG1 outcrossed animals. A GFP-labeled T-ALL engrafted into the progeny of CG1 by albino fish (CG1/Alb; A-C). Engraftment of T-ALLs into AB-strain zebrafish required 2 rounds of outcrossing to CG1 fish (D-I). A dsRED-labeled T-ALL engrafted into the progeny of a CG1 by CG1/AB rag2-GFP transgenic animal (D-F) or an Amcyan-labeled T-ALL engrafted into the progeny of a CG1 by CG1/AB mylz2-mCherry (G-I). Images photographed at 7.0×. All panels are merged images of fluorescent and brightfield photographs. GFP-labeled thymus is marked by T.