Expressed in the vascular and surrounding tissues in cotyledons. Detected in root apical meristems. Belongs to the jacalin lectin family. The plantago asiatica mosaic virus (PlAMV)-resistant ecotypes (cv. Bay-0, cv. Ga-0, cv. Dra-2, cv. Eil-0 and cv. Is-1) encoded a full-length 157-amino-acid proteins (AC H3JUC3), whereas in the susceptible ecotypes (cv. Col-0 and cv. Ler), the presence of a stop codon in the first exon results in the production of a N-terminal 36-amino-acid fragments (PubMed:22307853). However, the identification of a small peptide spanning an alternative splice junction leads to the proposal of an alternative gene model in cv. Columbia.