Before revision: The majority of toolkit genes are components of signaling pathways , and encode for the production of transcription factors, cell adhesion proteins, cell surface receptor proteins (and signalling ligands that bind to them), and secreted morphogens , all of these participate in defining the fate of undifferentiated cells, generating spatial and temporal patterns , which in turn form the body plan of the organism.
After revision: The majority of toolkit genes are components of signaling pathways ; and encode for the production of transcription factors cell adhesion proteins, cell surface receptor proteins (and signalling ligands that bind to them), and secreted morphogens , all of these participate in defining the fate of undifferentiated cells, generating spatial and temporal patterns , that, in turn form the body plan of the organism.