Fig. (5) EM analysis of IP₃R and RyR immunoreactivity in adult lacrimal gland sections. Representative images of IP₃R1, IP₃R2, IP₃R3, RyR1, RyR2, RyR3 staining. Arrows indicate 15 nm immunogold label in different subcellular compartments. Scale bar, 100nm (RyR1, RyR2, RyR3, IP₃R3, and 160nm (IP₃R1 and IP₃R2).