1. A part or structure in an embryo that influences the differentiation of another part. '��'��''''��'��'��''������̥��Ӱ���������ַֻ��IJ��ֻ���֯�ṹ��
2. The development of the family takes a parallel course, but here the periods have not such striking marks of differentiation. ��ͥ�ķ�չ��˲��У���������һ��չ����ʱ�ڵĻ���û���ṩ���������ı�־���ˡ�
3. So the study of regulating differentiation of stem cells toward mature, functional islets cells becomes the hotspot recently. Ϊ�ˣ����ظ�ϸ���ֻ�Ϊ������й��ܵ��ȵ�ϸ����Ϊ���������о��ȵ㡣
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n.
1. a discrimination between things as different and distinct
2. the mathematical process of obtaining the derivative of a function
3. (biology) the structural adaptation of some body part for a particular function