FGF21 and Hyperglycemia: To investigate if FGF21 administration protects against hyperglycemia-associated retinal vessel growth delay, native FGF21 or long-acting FGF21 (PF-05231023) was injected i.p. from P7 to P9 in STZ-induced hyperglycemic C57BL/6 J (WT) mouse pups.