Abstract
Monitoring the migrations of cells during embryonic development requires a system in which cells can be identifiedin situduring locomotion. One promising system involves the generation of chimeras by transplanting mouse cells into chick embryosin ovoto exploit the wealth of mouse genetic variants. The success of this technique relies on the ability to detect individual mouse cells in a chick environment with high specificity. The murine B2 family of short interspersed elements is present in the mouse genome at copy numbers in excess of 105, whereas this sequence is absent in the chick genome based on hybridization techniques. This differential of five orders of magnitude produces signals in mouse cells that are easily identified, even in an environment that is predominantly chick. Thus, the B2 repeat probe is highly effective for the purpose of identifying mouse cells in mouse–chick chimeras.
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