Leonard I. Zon Nature Immunology 2 , 142–143 (2001).

In the February issue of Nature Immunology some text was printed incorrectly. On page 143, column 1, line 13 of paragraph 2 should read “The effects of Shh are exerted by establishing BMP homeostasis in the bone marrow; Shh inhibits both BMP-4 and a BMP inhibitor called Noggin.”. In addition, line 34 of the same paragraph should read “Thus, for blood cells in the bone marrow, the regulation of BMP and Noggin by Shh “fine-tunes” the local effective concentration of BMP.”.

See Redirecting T cell specificity by TCR gene transfer by Paul A. H. Moss and the Self-renewal versus differentiation, a job for the mighty morphogens by Leonard I. Zon