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L E R O Y C. S T E V E N S
FIG. 6. Early teratoma completely enclosed by a seminiferous tubule in a 16-< ay
fetal mouse. Note the separation of the normal (left) from the neoplastic (right)
cells. X 380.
FIG. 7. Early teratoma which has ruptured the seminiferous tubule of a 2-day-old
mouse. Undisturbed germinal epithelium (ge) at the left. Tumor cells and cellular
debris at the right. X 380.