Table : table 17.4 C. elegans Genes Essential to Multicellularity

Function	Protein/domain	Number of genes
Transcription control	Zinc finger; homeobox	540
RNA processing	RNA binding domains	100
Nerve impulse transmission	Gated ion channels	80
Tissue formation	Collagens	170
Cell interactions	Extracellular domains; glycotransferases	330
Cell–cell signaling	G protein–linked receptors; protein kinases; protein phosphatases	1,290