令人惊讶的是，胚胎中局部区域产生了迁移的神经嵴细胞和他们衍生的细胞型，它们与神经或中胚层组织完全无关。
Surprisingly, restricted regions of the embryo generated both migrating neural crest cells and their derivative cell types, without any interaction with neural or mesodermal tissues.
结果表明：（1）男生6— 8岁各组为均衡的中胚层体型，9— 12岁各组为三胚层中间型体型，13— 17岁各组为中胚层-外胚层均衡型体型。
The results showed: (1) Among boys, the mean somatotypes in age groups 6—8 are balanced mesomorph, 9—12 are central, and change to meso ectomorph in age 13—17;
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