Melanin is a that is produced in organelles called in specialized cells called .

Melanocytes

Explanation:

Melanocytes produce the protective skin-darkening pigment melanin. Melanocyte, specialized skin cell that produces the protective skin-darkening pigment melanin. Birds and mammals possess these pigment cells, which are found mainly in the epidermis, though they occur elsewhere like in the matrix of the hair.

answer an inhibitory neurotransmitter in the brain;