On a rat, which has spontaneous died 12 months after 4 times i.p. application of aflatoxin during pregnancy, there has been found a frontal tumor barely of the size of a pepper-corn which came out from the leptomeninx. A comparison to the Abrikossoff tumor concerning the light- and electron-microscope as well as the nucleic-acid concentration is justified. The protein content of the granula of the tumor cells is higher than the values known in the granular-cell myoblastoma of man.
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