Figure 2. Localization of B₂-receptor immunoreactivity in ocular tissues of human and cynomolgus monkey eyes. Section A shows robust labeling of human ciliary muscle (h-CM) fibers and NPCE cells, while section B is the negative control (IgG control) for human eye sections. The labeling of monkey CM fibers and NPCE cell B₂ receptors is evident in section C. Once again, no specific labeling was observed in the IgG control section of the monkey eye (section D). The scale bar shown in D (100 μm) applies to all the figures.