Inhibits adhesion of cells expressing alpha-4/beta-1 (ITGA4/ITGB1) and alpha-4/beta-7 (ITGA4/ITGB7) integrins to the natural ligands vascular cell adhesion molecule 1 (VCAM-1) and mucosal addressin cell adhesion molecule 1 (MADCAM-1). Heterodimer; disulfide-linked. Expressed by the venom gland. Belongs to the disintegrin family. Dimeric disintegrin subfamily.