Lung alveoli, fluorescence micrograph
Fluorescence deconvolution micrograph of a section through lung tissue showing the alveoli, the tiny air sacs of the lungs where gases are exchanged between the air and the blood in the blood vessels. Nuclei are blue and nitric oxide synthase enzymes red. Nitric oxide synthase helps to regulate blood flow to the lungs., Photo by R. BICK, B. POINDEXTER, UT MEDICAL SCHOOL/SCIENCE PHOTO LIBRARY
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