Involved in plant defense. Confers resistance to the bacterial pathogen Xanthomonas through recognition of the microbe-associated molecular pattern (MAMP) eMax (PubMed:23898033, PubMed:24384530). Functionality seems to depend on the presence of the receptor kinase SOBIR1 as an adapter protein (PubMed:24384530). Lack of responsiveness to MAMP eMax from Xanthomonas. Belongs to the RLP family. Was originally thought to correspond to two different genes. Was originally thought to correspond to two different genes. Truncated N-terminus.