Fig. 1. mAb 313, which selectively recognizes 3-nAChRs, shows a pattern of immunoreactivity very similar to that exhibited by mAb 210 in permeabilized tissue. (A) Submucous ganglion stained with mAb 210 (17 nmol l^–1) and FITC-goat-anti-rat (1:1000). Scale bar, 25 µm. (B) Submucous ganglion stained with mAb 313 (35 nmol l^–1) and FITC-goat-anti-rat (1:1000). Scale bar, 20 µm. In both preparations, the tissue was permeabilized with 0.5% Triton X-100.