substrate « Back to Glossary IndexThe starting molecule that is modified in a chemical or enzymatic reaction. Related Articles: 13 – 3 The viral life cycle, early events14 – 5 Some examples of host-microbe interactions16 – 2 Adaptive Immunity – introductory concepts17 – 5 Antimicrobial compounds directly inhibit or kill pathogens18 – 2 Introduction to pathogenesis« Back to Glossary Index