Protein breakdown in the brain. Subcellular distribution and properties of neutral and acid proteinases By N. MARKS and A. LAxA Volume 89 (1963) p. 440, Fig. 1, Supernatant S2: for 14 500g x 75 min. read 14 500g x 15 min. The enzymic conversion of coproporphyrinogen III into protoporphyrin IX
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