1 Some virulent bacteria produce proteins that either disrupt host cell membranes or stimulate their own endocytosis or macro-pinocytosis into host cells. 2  These virulence factors allow the bacteria to enter host cells and facilitate entry into the body across epithelial tissue layers at the body surface.
Definition of revoke for English Language Learners : to officially cancel the power or effect of (something, such as a law, license, agreement, etc.) : to make (something) not valid REVOKE Defined for Kids
Revoking an Offer. Whoever makes an offer can revoke it as long as it hasn't yet been accepted. This means that if you make an offer and the other party wants some time to think it through, or makes a counteroffer with changed terms, you can revoke your original offer. Once the other party accepts, however, you'll have a binding agreement. Revocation must happen before acceptance.