Belongs to the RLP family. In strain cv. Columbia (AC Q9SLI6), a naturally occurring variation results in the deletion of 35 amino acids in the middle part of the protein. The sequence shown is from strain cv. Landsberg erecta. Was originally thought to be involved in Peronospora parasitica resistance (PubMed:15155873). However, the corresponding article has been retracted (PubMed:17284584).