passages.id: split_6_test_2855_passage
passages.type: progene_text
passages.text: SEA caused a rapid induction of IL-2 mRNA in T cells of spleen , lymph node , and thymus , followed by the appearance of high systemic IL-2 serum levels ( 5 ng / ml ) , and a significant increase of CD25 on CD4 + and CD8 + lymphocytes .