Phloem protein 2 (PP2) is one of the most abundant and enigmatic proteins in the phloem sap. PP2 is translocated in the assimilate stream where its lectin activity or RNA-binding properties can exert effects over long distances [1].

1: Diversity of the superfamily of phloem lectins (phloem protein 2) in angiosperms. Dinant S, Clark AM, Zhu Y, Vilaine F, Palauqui JC, Kusiak C, Thompson GA; Plant Physiol. 2003;131:114-128. PMID:12529520