To examine the number and size of erythrocytes, Tg(hsp:EGFP-γGH) was crossed with Tg(gata1:dsRed) to generate the double-transgenic larvae, which simultaneously displayed red fluorescent erythrocytes and folate deficiency upon heat-shock induction. Here, HSP90B2P is linked to hyperinsulinemic hypoglycemia, familial, 4.