The following is an excerpt.
Scientists in Uruguay modified the genes of sheep using the fluorescent protein from an Aequarea jelly fish, causing the sheep to glow-in-the-dark. The sheep were born last October at the Animal Reproduction Institute of Uruguay. The sheep glow when they are exposed to certain ultraviolet light, emitting a glowing green color. Aside from glowing in the dark, Uruguay scientists assures everyone that these sheep are developing normally.
Read the full article here: Uruguay scientists genetically modify sheeps to glow in the dark