nucleotide-binding oligomerization domain-containing protein 1, 2

initialisms: NOD1, NOD2
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.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1222 [Terms] [Paper]