“…It starts with the recognition of a signal from inside or outside the cell followed by transduction of such signal to the area of interest wherein a coordinated action of genes facilitates reorganization of cytoskeletons and organelles toward creation of an entirely different cell (Kost et al 2002). Stimuli include hormones and external physical and chemical signals (Dornelas 2003;Ramirez-Parra et al 2005). Understanding cell differentiation provides important information regarding multicellularity, adaptation and diversity.…”