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Nerve growth factor receptor. Computer artwork showing a high affinity nerve growth factor receptor (TrkA) bound to the membrane of a cell. TrkA is the high affinity catalytic receptor for the neurotrophin Nerve Growth Factor (NGF). As such, it mediates the multiple effects of NGF, which include differentiation and growth of nerve cells, and avoidance of programmed cell death. (KEYSTONE/SCIENCE PHOTO LIBRARY/RAMON ANDRADE 3DCIENCIA)