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We investigated the inositol phospholipid transmembrane signaling pathway as a possible mediator of neurotrophic (mitogenic) signals in the newt limb regeneration blastema. Blastema mesoderm tissues were prelabeled with myo-[ 3 H]inositol, treated with 10 m M LiCl and then exposed to substance P or to extracts of spinal ganglia, brain, or spinal cord. Stimulation with substance P resulted...