I am in an embryology course right now and we've just startedcovering cell-cell communication in development. We were talkingabout the roles of the various cadherins and their discoveries butwe got to cell signaling pathways and in reading my textbook I'mfinding myself confused by these pathways-- some of those that arementioned include Notch, Wnt, FGF, TGF-beta, RTK, Jak-Stat, SMAD,integrins, PTHrP, Hedgehog, Discoidin domain receptors 1&2, andthe unfolded protein response (UPR).
I know the RTK pathway and I know the SMAD pathway, but theothers just seem to be specific ligands that are using thesepathways -- is this correct?