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![Preneoplastic foci in mice fed diethyl 1, 4-dihydro, 1, 4, 6-trimethyl 3, 5-pyridine decarboxylate are resistant to protoporphyrin accumulation](https://image.oaes.cc/0296a05a-9877-4bce-b03f-58362499d09f/1151.fig.1.png)
Figure 1. Liver from a mouse fed diethyl 1, 4-dihydro, 1, 4, 6-trimethyl 3, 5-pyridine decarboxylate for 1 year (×57). Note the hyperplastic nodule is devoid of brown protoporphyrin pigment, whereas the surrounding normal liver parenchyma is filled with protoporphyrin deposits