Horizontal cells
The horizontal cell body is located in the inner nuclear layer, its dendrites are connected with photoreceptors and modulating the signal sent between photoreceptors and bipolar cells. Most mammals have two kinds of horizontal cells (Chapot, Euler and Schubert, 2017).
Antibodies that label the Horizontal cells
References
Chapot C A, Euler T, Schubert T. 2017. How do horizontal cells ‘talk’ to cone photoreceptors? Different levels of complexity at the cone–horizontal cell synapse. The Journal of Physiology. 595:5495-5506.