Table 1.

LRR-type PRRs involved in plant defense signaling.

PRR	Plant species	Ligand	Reference
LRR-RLK type
AtFLS2	Arabidopsis thaliana	Flagellin (Flg22)	Chinchilla et al. (2006)
AtEFR	A. thaliana	Ef-TU	Zipfel et al. (2006)
XA21	Oryza sativa	Activator of XA21 (Ax21)	Lee et al. (2009)
XA3/XA26		Epitope derived from Xanthomonas oryzae pv oryzae	Sun et al. (2004)
SR160	Lycopersicon peruvianum	(pro)systemin	Scheer and Ryan (2002)
PEPR1	A. thaliana	PEPR1	Krol et al. (2010)
NORK	Medicago truncatula	?	Endre et al. (2002)
SYMRK	Lotus japonicus	?	Stracke et al. (2002)
LRR-RLP type
LeEIX2	Lycopersicon esculentum	Xylanase (EIX)	Ron and Avni (2004)
Ve1	L. esculentum	Ave1 peptide	Fradin et al. (2009)