P2RX3 and tuberculosis: Whereas TB cells are dependent on an intact innervation22, after loss of TB in rats that had been gavaged for up to 28d a robust innervation was retained in FP, including lingual nerve fibers (Fig. 2c, K19/NF) and P2X3-labeled fibers of the CT nerve (Fig. 2c, K18/P2X3).