In microscopy a nucleus is normally stained using
(a) Neutral red
(b) Janus green B
(c) Eosin
(d) Hematoxylin
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In microscopy, staining can be used to differentiate easily between cell structures and tissues. Haematoxylin and eosin are often used in combination in histology procedures. Haematoxylin target nuclei, (thus the correct answer is D) staining them blue to violet, while eosin stains the cytoplasm pink. Janus Green B is used in the staining mitochondria, and Neutral red is used as a general stain and a pH indicator.
The picture below shows a section of cartilage, which was stained using haematoxylin and eosin (H&E stain) By Ganímedes - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=30108643
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