Final answer:
Yap is involved in regulating cell-cell adhesion and tissue growth in alpha-catenin.
Step-by-step explanation:
In alpha-catenin, Yap (Yes-associated protein) plays a crucial role in regulating cell-cell adhesion and tissue growth. Yap interacts with alpha-catenin, a protein involved in the attachment of actin filaments to cell junctions. Yap is responsible for modulating the activity of alpha-catenin and influencing cell signaling pathways that affect cell shape and proliferation.