This quantitative measure indicates how much of a particular drug or other substance ( inhibitor ) is needed to inhibit a given biological process ( or component of a process , i.e. an enzyme , cell , cell receptor or microorganism ) by half .
It indicates how much of a particular drug or other substance is needed to inhibit a given biological process ( or component of a process , i.e. an enzyme , cell , cell receptor or microorganism ) by half .