To take the scalp of someone else in a dream is to steal their sense of self. Brush Holding a hair brush in a dream symbolizes your appearance and the work you carry out to achieve the image you desire. Dreaming of a paint brush generally indicates the appearance of your home and the work it takes or it'll take to achieve the image you want.
A protein that typically promotes cell division when a growth factor is present on the cell surface. Abnormal ras proteins, caused by genetic mutations, stimulate cell division and proliferation in the absence of a growth factor and facilitate the development of various cancers.
Example of an effector enzyme that binds to growth factor receptors. SOS, exchange factor, promotes exchange of GTP for GDP on Ras; Ras is a monomeric G protein that activates a protein kinase called Raf. Example of a kinase cascade activated by growth factor receptors. Raf, a protein kinase that is activated by Ras.