- Cyclopentenyl cytosine inhibits cytidine triphosphate synthetase in paediatric acute non-lymphocytic leukaemia: a promising target for chemotherapy. Verschuur, A.C., Van Gennip, A.H., Leen, R., Muller, E.J., Elzinga, L., Voûte, P.A., Van Kuilenburg, A.B. Eur. J. Cancer (2000)