Nonrandom distribution of receptors for melanocyte‐stimulating hormone on the surface of mouse melanoma cells

Abstract
An improved bubble method was developed for applying an ultrathin layer of nuclear track emulsion on the surface of cells labeled with I125-MSH. The autoradiographs of I125-MSH binding indicate a nonrandom distribution of receptors on the surface of mouse melanoma cells. It is suggested that MSH receptors are displayed in clusters previous to an independently of their exposure to the hormone.