Holtfreter notebook page showing cells time sequence after treatment with KOH (potassium hydroxide)
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Hand drawn sketches pencil of cells and embryos along with with hand written notesHand drawn sketches of cells from an amphibian embryo that have been treated with KOH (potassium hydroxide). Holtfreter has sketched an embryo and then a time sequence of cells after being treated with KOH. Hand written notes accompany the diagrams.