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Abstract
The integrins are a large family of cell adhesion receptors, involved in cell-cell and cell-matrix interactions. At present, 20 different integrin heterodimers are known. Integrins participate in a complex apparatus anchoring cells to their surroundings and transducting signals into the cells. These signals regulate many important aspects of cell behaviour, including growth, differentiation, and phenotype. This is an overview of the molecular and cellular biology of the integrin-type extracellular matrix receptors. Integrins may play a central role in the healing process of tissue injuries, and in many diseases, especially in human cancer.