A 42-year-old woman presents with a 6-month history of fatigue, weight gain, and cold intolerance. On examination, she has a firm, diffuse goiter. Thyroid function tests show elevated TSH and low free T4. Anti-TPO antibodies are positive. A thyroid biopsy is performed. The histological specimen shows dense lymphoplasmacytic infiltrate with germinal centers, atrophic follicles, and fibrous stroma. The structure marked **B** in the diagram consists of metaplastic follicular epithelial cells with abundant eosinophilic granular cytoplasm. What is the primary composition of the cytoplasm of the cells marked **B**?
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