Abstract
Summary
Alterations in light cycles hasten brain maturation of the young rat, produce greater brain excitability and involution of the thymus gland.
The author expresses gratitude to: Dr. C. Ebby for his cooperation in housing of experimental animals, Dr. P. S. Timiras for critical evaluation of the mansucript and Miss L. O'Brien and Mr. T. Castellano for technical assistance.
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