问题关键在于找到正确的诱导干细胞分化成心脏细胞，神经细胞，制造胰岛素的细胞或者其他细胞的生长因子的正确方法。
The key lay in finding just the right recipe of growth factors and nutrients to induce a stem cell to become a heart cell, a neuron, an insulin-making cell or something else.
这就引出问题，转录因子是否能直接诱导其它明确的体细胞，而不仅是未分化状态的细胞。
This raised the question of whether transcription factors could directly induce other defined somatic cell fates, and not only an undifferentiated state.
背景资料概要：目前已有不同的生长和分化因子使用于脊柱融合中诱导骨形成。
Summary of Background Data. Different growth and differentiation factors are currently being used for inducing bone formation in spinal fusion.
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