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Confocal microscopy of fluorescent protein expression in HeLa cells. (A) ppluGFP2 (green fluorescent protein from Pontellina plumata) forms needles 3 days after transfection. (B) ppluGFP2–β-actin fusion protein. (C) TurboGFP–β-actin fusion protein. (D) Enhanced green fluorescent protein–β-actin fusion protein.
