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SEM micrographs of L929 cells grown onto (A and A′) coverslips; (B and B’) Alg/CS scaffold; (C and C’) Alg-CS scaffold; (D and D’) Alg-CS-Flu scaffold after 5-d culture. (A–D) magnified 200 times; (A’–D’) magnified 500 times. The red arrows represent L929 cells.
