Figure 4.  NKG2-expressing NK cells develop exactly in parallel with CD94hi NK cells
		Fresh E14 thymocytes contain a small but easily detectable subpopulation
		of NKG2+ cells of similar size to the CD94hi subpopulation
		These increase slightly in number during the initial culture period in IL4+PMA
		And continue to do so in IL2
		By 6 days after transfer to IL2 about 25% of cells are NKG2+
		By 16 days the proportion of NKG2hi cells has reached maximal levels
		The proportion of NKG2hi cells then declined to <5% by day 40.
		About 70% of adult splenic NK cells are NKG2+
Conclusions
1.  Throughout development, the proportion of NK cells expressing NKG2 is similar to the proportion that are CD94hi
2.  The proportion of cells that express Qa1 receptors, as judged by staining with Qa1 tetramers, is similar to the
proportion of cells that are NKG2+ and CD94hi [data not shown]