Sputum of yellow color produced by an elderly man at at peak of his severe cold was fixed in glutaraldehyde, dehydrated in ethanol, and critical-point dried. The structure varied from knotty fibers to round and oval particles (bacteria such as Staphylococcus aureus - green) to ornamented flat sheets of similar dimensions (most probably epithelial cells - gray). Enhanced SEM. Image width: 492 micrometers. Magnification: 203x if the image is printed 10 cm wide.
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