Interplexiform, horizontal and bipolar-like cells of the rabbit retina take up exogenous serotonin during early...

A subpopulation of amacrine cells which have the ability to take up exogenous serotonin occur in the rabbit retina at all stages during postnatal development. However, during the initial stages of the retina's development some serotonin-accumulating neurons are also associated with the outer plexiform layer in the form of interplexiform and/or bipolar and/or horizontal cells. These neurons could have an additional function of their own or simply be misplaced serotonin-accumulating neurons destined to degenerate in the process of synaptogenesis.