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A cultured skin fibroblast cell of a goat ' $\mathrm{P}$ ' was fused with an enucleated ovum of a goat ' $\mathrm{Q}$ '. The resultant activated early embryo was then transplanted into a pseudopregnant (surrogate) female goat ' $\mathrm{R}$ ' of the same strain as ' $\mathrm{Q}$ '. On completion of gestation, a female goat ' $\mathrm{S}$ ' was born. With the exception of mitochondrial DNA, ' $\mathrm{S}$ ' is a clone of $\_\_\_\_\_\_\_\_$.

  1. Only $\mathrm{P}$
  2. Only $\mathrm{Q}$ 
  3. Only $\mathrm{R}$
  4. Both $\mathrm{P}$ and $\mathrm{R}$

     

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