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substrate [substrates]▼(the material or substance on which an enzyme acts)noun[UK: ˈsʌb.streɪt] [US: ˈsʌb.ˌstret]
substratum [substrata]▼(a layer that lies underneath another)noun[UK: ˌsʌb.ˈstrɑː.təm] [US: ˌsʌb.ˈstrɑː.təm]
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