<p><strong>Fig. 1.4.</strong> (<strong>C</strong>) This is a confocal fluorescence microscope shows <em>Tetrahymena thermophilia</em>, a single-celled organism commonly used in biomedical research.</p>

Fig. 1.4. (C) This is a confocal fluorescence microscope shows Tetrahymena thermophilia, a single-celled organism commonly used in biomedical research.

Image courtesy Richard Robinson, PLOS Biology