1. A definite, regular, and reproducible inhibition of two transplantable acute lymphoid leukemias in mice resulted from parenteral administration of the guanine analog, guanazolo.

  2. No effect of this compound on a transplantable lymphosarcoma was observed.

  3. Apparent release of inhibition by the use of guanine HCl is recorded.

*

The technical assistance of Mr. Peter Boyle and Mr. J. H. Miller is gratefully acknowledged.

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