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reactant [reactants]▼(participant at the start of a chemical reaction)noun[UK: ri.ˈæk.tənt] [US: ri.ˈæk.tənt]
substrate [substrates]▼(the material or substance on which an enzyme acts)noun[UK: ˈsʌb.streɪt] [US: ˈsʌb.ˌstret]
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