In the limb bud. patterning along the anterior-posterior (A-P) axis is controlled by Sonic Hedgehog (Shh). a signaling molecule secreted by the "Zone of Polarizing Activity". an organizer tissue located in the posterior margin of the limb bud. https://www.ngetikin.com/deal-time-Orange-Zinger-Tomato-Container-Cherry-Tomatoes-Lycopersicon-Esculentum-5-Seeds-mega-super/