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In an experiment, the right forepaw of a developing mouse embryo is examined. The tissue and cellular structure are microscopically analyzed with histology at several developmental time points.

In the earliest time point, a population of cells located between the future digits of the paw is found to undergo growth-arrest and then subsequent cell death.

If the student wished to track the cells during limb development, what would be the most appropriate strategy?


A transgenic gene that will activate when the mesoderm is specified.


A compound that becomes fluorescent when activated by caspases.


A fluorescent compound that is incorporated into the genomic DNA.


A nanoparticle that becomes fluorescent when the tonicity of the cell increases.

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