Figure 2

Stem cells were found in lymphatic organs after intravenous injections. Original magnification ×40. Anti-SV40 immunohistochemistry. (a) Lymph node 3 days; (b) spleen 3 days; (c) Peyer's patch of the small intestine 3 days; (d) thymus 3 days. SV40, simian virus 40.