This domain is found at the C-terminus of expansins, plant cell wall proteins involved in the non-enzymatic rearrangement of cell walls during cell growth. It contains the allergens lol PI, PII and PIII from Lolium perenne.

1: Complete primary structure of a Lolium perenne (perennial rye grass) pollen allergen, Lol p III: comparison with known Lol p I and II sequences. Ansari AA, Shenbagamurthi P, Marsh DG; Biochemistry 1989;28:8665-8670. PMID:2605214

2: Nomenclature for members of the expansin superfamily of genes and proteins. Kende H, Bradford K, Brummell D, Cho HT, Cosgrove D, Fleming A, Gehring C, Lee Y, McQueen-Mason S, Rose J, Voesenek LA; Plant Mol Biol. 2004;55:311-314. PMID:15604683