Derived from tyrosine, this complex compound comes in two classes: one form is yellow-to-reddish brown, soluble in alkali solutions sometimes called trichromes. The other is a black or dark brown compound that is insoluble. For ten points, name this chemical found primarily 
Derived from tyrosine, this complex compound comes in two classes: one form is yellow-to-reddish brown, soluble in alkali solutions sometimes called trichromes. The other is a black or dark brown compound that is insoluble. For ten points, name this chemical found primarily in the retina and in hair, responsible for protecting the skin from harmful ultraviolet rays.
Derived from tyrosine, this complex compound comes in two classes: one form is yellow-to-reddish brown, soluble in alkali solutions sometimes called trichromes.
{Melanin} (do NOT accept “melatonin”)