1.GM2 is found mainly in neurons, so without HEX-A, it accumulates inside lysosomes.

GM2通常布在元中，因此如果HEX-A缺失，GM2就会在溶酶体中积蓄。

2.Also, between the circular and the longitudinal muscle layer, there's a plexus, or networks of nerves, which help coordinate muscle contraction and relaxation.

另外，在内环肌和外纵肌之间，还有（）布；可以协调肠道平滑肌收缩与舒张。

3.In the thoracic region of the spine, neural crest cells differentiate into the neurons of the sympathetic chain, lying on either side of the entire spinal cord.

在脊柱胸椎节段，嵴细胞化成交感链元，布在整条脊髓两侧。

4.That's the stage when individuals usually experience pain, although pain can also occur when the caries lesion involves the dentin layer since sensory nerve fibers travel through tubules in the dentin.

在这个阶段，患者常会感到疼痛，但牙本质层受累产生龋坏时也可能有疼痛产生，因为感觉也布在牙本质管道中。