The detailed morphology of SRs and SSCs' synaptic endings in the OPL were revealed. In the wholemount retina double-labeled with S-opsin and SV2, both SRs and SSCs's terminals (blue, top, A) contained SV2 (red, middle, A) at their synaptic endings (bottom, A). In the retinal sections double-labeled with the two antibodies, the co-localization of SV2 with SRs (top and middle, B) and SSCs' (bottom, B) synaptic endings was also evident. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this paper.)