A true epithelial tissue is present only in a single layer of cells held together via occluding junctions called tight junctions.
真正的上皮组织仅存在于通过称为紧密连接的咬合带而保持在一起的单层细胞中。
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To obtain singlecells for tissue engineering, researchers have to first break tissue apart, using enzymes that digest the extracellular material that normally holds cells together.