A 6-year-old girl is brought to the office by his parents due to diffuse reddish lace-like rash on her arms, legs, thighs, and buttocks. Her mother explains that the girl also developed a bright red rash on his cheeks two days ago. She has low-grade-fever, myalgias, rhinorrhea and headache one week ago. Her elder sister had similar symptoms two weeks ago that resolved without any treatment. On examination, a lacy, reticular, erythematous maculopapular rash is present on her extremities. The agent responsible for this girl's symptoms replicates in precursors of which of the following cells?

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