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(A) shows an overview of the cells of the ciliated frontal surface, (B) is a higher magnification of the same, (C) shows the nucleus in higher magnification and (D) shows details of the cell surface. go, Golgi apparatus; nu, nucleus; ci, cilia; mu, mucus granule; mv, microvilli; np, nuclear pore; cr, ciliary root; rer, rough ER; mi, mitochondria.
