Effect of melatonin treatment on 24-h variations in responses to mitogens and lymphocyte subset populations in rat submaxillary lymph nodes

1. Castrillón, P.O.
2. Esquifino, A.I.
3. Varas, A.
4. Zapata, A.
5. Cutrera, R.A.
6. Cardinali, D.P.