Juniper Publishers- Journal of Cell Science Abstract The basic objective of this research work is to evaluate the mechanism of action of compound Epigallocatechin, Epicatechin and Stigmasterol Phytosterol (Synergy), Aspidofractinine-3-methanol) and Terephthalic acid, dodecyl 2-ethylhexyl ester with Selected clinical isolates by using molecular biomarker MazEF9 TA system. Toxin-Antitoxin (TA) systems are highly conserved in members of the Gram positive +ve and Gram negative –ve bacteria which has been proposed to play an important role in physiology and virulence. Clinical microorganisms were cultured and Sub-culturing in Department of Microbiology and Centre for Biocomputing and Drug Development (CBDD), Adekunle Ajasin University, Akungba Akoko, Ondo-state, Nigeria. A 12 hours old culture of each microorganism was re-suspended in plant extract at 1000 μg mL in a total volume of 500μl for 0, 15, 30, 45, 60, and 180 minutes. Keywords: Post segregational killing mechanism epigal