球磨后粉末形状从原来的长条状转变为细小的球状；
Particle shape varies from long strip to fine globosity after milling.
这种形状上的变化将通常状况下无活性的激酶转变为活性形式，随后将能够激发细胞生长的信号传递到胞内。
This change of shape converts the normally inactive kinase into an active one, which then sends signals inside the cell that trigger cell growth.
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