A Research Lab Working with Mouse Cells Characterized Three Mutant

A research lab working with mouse cells characterized three mutant cell lines summarized in the table below. Which of these is most likely to contain a mutated form of P-TEFb? Explain.
$$\begin{array} { | c | c | c | c | } \hline \begin{array} { c } \text { Mutant } \\\text { cell line }\end{array} & \text { Transcription initiation } & \text { Transcription elongation } & \text { Histone modification } \\\hline \mathrm { X } & \text { Functions normally } & \begin{array} { c } \text { Unable to make } \\\text { transcripts larger than } 50 \\\text { nucleotides }\end{array} & \text { Functions normally } \\\hline \mathrm { Y } & \begin{array} { c } \text { Lost sensitivity to a } \\\text { transcriptional repressor }\end{array} & \text { Functions normally } & \text { Functions normally } \\\hline \mathrm { Z } & \text { Functions normally } & \text { Functions normally } & \begin{array} { c } \text { Lost ability to } \\\text { deacetylate histones }\end{array} \\\hline\end{array}$$

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Mutant cell line X most likely carries a...

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