它们允许一定量的盐分进入它们的细胞，将水中的盐分带进植物体内，并把其体内的盐含量提高到比周围海水稍高的浓度。
They allow a certain amount of salt to enter their cells, bringing the salt content of the water within the plant, to a slightly higher concentration than that of the surrounding seawater.
后者允许他们能容易地观察哪些细胞包含新基因物质---带有新基因的猫会发绿光。
The latter allowed them to easily visualize which cells contained the new genetic material—cats with the gene glow green (see picture).
新的胚胎筛检技术称为基因组杂交比较，允许医生从几天大的胚胎上提取细胞。
The new screening tecnique, called comparative genomic hybridisation, allows doctors to remove cells from an embryo when it is a few days old.
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