https://doi.org/10.1351/goldbook.13519
Members of a family of human intracellular proteins involved in the detection of invasive bacteria and activation of the $\ce{NF\kappa B}$ transcription factor pathway.
Note: In epithelial cells, NOD1 is essential for sensing intracellular Gram-negative bacteria through a tripeptide motif in the bacterial peptidoglycan.