Caudal endothelial cells are enriched in niche cytokines. (A) Experimental outline. (B-H) qPCR of hematopoietic niche cytokine expression in FACS-sorted cells outlined in A; data represent biological triplicates. Statistical analysis was completed using an unpaired Student t test, comparing cytokine expression to whole zebrafish. Data represents mean ± SEM. eGFP, enhanced green fluorescent protein; NS, not significant. *P < .05; **P < .01; ****P < .001.