| http://www.w3.org/ns/prov#value | - The growth room obviously should be as free from dust and other possible contaminants as possible. (Gnats and even ants are able to invade test tubes or jars.) Trays of test tubes or jars are kept under fluorescent lights on a 16-hour day (10 to 12 inches from the lights) and at a temperature of from 70??? to 80???F. When green shoots or callus (a mass of green tissue) appear the explants are read
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