I don't appreciate that the article waits until the very last paragraph to explain wtf breeding glowing monkeys has to do with studying Parkinson's.

Japanese researchers have genetically engineered monkeys whose hair roots, skin and blood glow green under a special light, and who have passed on their traits to their offspring, the first time this has been achieved in a primate.

They spliced a jellyfish gene into common marmosets, and said on Wednesday they hope to use their colony of glowing animals to study human Parkinson's disease and amyotrophic lateral sclerosis or ALS.