Comment on

• Negative feedback defining a circadian clock: autoregulation of the clock gene frequency.

  Aronson BD, Johnson KA, Loros JJ, Dunlap JC. Aronson BD, et al. Science. 1994 Mar 18;263(5153):1578-84. doi: 10.1126/science.8128244. Science. 1994. PMID: 8128244
• Loss of circadian behavioral rhythms and per RNA oscillations in the Drosophila mutant timeless.

  Sehgal A, Price JL, Man B, Young MW. Sehgal A, et al. Science. 1994 Mar 18;263(5153):1603-6. doi: 10.1126/science.8128246. Science. 1994. PMID: 8128246
• Block in nuclear localization of period protein by a second clock mutation, timeless.

  Vosshall LB, Price JL, Sehgal A, Saez L, Young MW. Vosshall LB, et al. Science. 1994 Mar 18;263(5153):1606-9. doi: 10.1126/science.8128247. Science. 1994. PMID: 8128247