“In the presence of 10(-5)m NAA , cell number increased as the kinetin concentration was increased between 10(-9) and 10(-6)m.”
“In the presence of 5 x 10(-7)m kinetin, NAA stimulated cell proliferation between 10(-7) and 10(-5)m, but no tracheary elements were formed without auxin, or with 10(-7)m NAA.”