Intrathymic signalling in immature CD4+CD8+ thymocytes results in tyrosine phosphorylation of the T-cell receptor zeta chain.
Nakayama T, Singer A, Hsi ED, Samelson LE. Intrathymic signalling in immature CD4+CD8+ thymocytes results in tyrosine phosphorylation of the T-cell receptor zeta chain. Nature. 1989 Oct 19; 341(6243):651-4.