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Nomarski photomicrographs of E. huxleyi strain 1516 during phase transition from the S-cell to the C-cell stage. Note the “packing behavior” of S-cells beginning by about days 2 to 3, resulting in the formation of extremely large aggregations, and the eventual appearance of C cells within and around the S-cell packs by about day 9. Magnifications: D1, ×800; D3, ×320; D8, ×600; D14, ×600.
