Needle biopsy (health) and Perls' Prussian blue stain (medicine)

Needle biopsy (health)

Biopsy procedure in which a small sample of tissue is removed through a hollow needle.

Perls' Prussian blue stain (medicine)

Perls' Prussian blue stain
<technique> A stain for ferric iron as in haemosiderins, using potassium ferrocyanide in acetic acid or dilute hydrochloric acid followed by a red counterstain such as safranin O or neutral red; various haemosiderins and most mineral irons give a blue-green reaction, while nuclei stain red.

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