G proteins are so-called because they bind the guanine nucleotides GDP and GTP. They are heterotrimers (i.e., made of three different subunits) associated with. the inner surface of the plasma membrane and. transmembrane receptors of hormones, etc. These are called G protein-coupled receptors (GPCRs).
Apply the metal paint to the mailbox in slow and even sections. Be sure to cover every inch of the metal mailbox including the door, hanging lip and the back. When this layer is dry remove the tape from the mailbox flag.
Examine the steel garage doors carefully. Look for spots where the paint is peeling, and use the paint scraper to remove the paint. Sometimes the paint will be free of the metal but has yet to crack. For this reason, you will go over the door with a paint scraper in areas with no visual damage.