Abstract
The Na+-dependent transport system for the amino acid proline in unstimulated lymphocytes decays with a half-life of about 4 h when protein synthesis is inhibited by cycloheximide, but the system in mitogen-activated lymphocytes is more stable. However, the early increase in activity of this transport system after mitogen addition is not due to a direct effect on its stability, but is a secondary effect requiring protein synthesis.
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