What is one difference between melanocytes and Merkel cells?
 Melanocytes are cube-shaped, while Merkel cells are oval-shaped.
 Melanocytes contain skin-darkening pigment, while Merkel cells contain touch receptors.
 Merkel cells are in the epidermis, while melanocytes are in the dermis.
 Merkel cells have melanin, while melanocytes do not have melanin.