Extracellular occurring or situated outside a cell 胞外的：产生或定位于细胞的外部。
2.
A leucine zipper pattern is located in the membrane proximal extracellular domain ( mped ) of bt - r3 protein . this is a very important character of cadherin 另外，它还有1个亮氨酸拉链序列，位于胞外的近膜区( mpr ) ，这是钙粘蛋白的重要特征之一。
