On media modified with low cytokinin/auxin ratios, for example 16.8/1.0 and 16.8/1.2 ZN/NAA combinations, the East African Highland banana (AAA-EA) cultivars showed single shoot development and callus induction due to apical dominance resulted from increased level of auxin concentration. In another study, Buah et al. demonstrated that differences exist in the relative strengths of different cytokinin types in inducing shoots. This differential ability of different hormones in inducing shoots in-vitro may be attributed to factors such as stability, mobility and the rate of conjugation and oxidation of hormones.