What dose of antagonist, agonist, or signaling tool should be used in vivo?

This is complex and depends on a number of factors including the method of administration (intravenous, intramuscular, or intraperitoneal), bioavailability, half-life, rates of hepatic and renal clearance, binding to proteins, drug interactions and tissue-specific distribution and accumulation. As we do not carry out any biological studies of our products in vivo, we therefore recommend that you review the published literature for dosage guidelines.