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Source:
Science. 2/15/1991, Vol. 251 Issue 4995, p796. 4p. 2 Black and White Photographs, 2 Charts.
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Source:
Clinical & Experimental Immunology. May1991, Vol. 84 Issue 2, p219-222. 4p.
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Source:
Lancet. 12/21/1991, Vol. 338 Issue 8782/8783, p1562. 2p.
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Source:
Science News. 6/8/91, Vol. 139 Issue 23, p359. 1/3p.
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Source:
Science. 12/20/1991, Vol. 254 Issue 5039, p1805. 4p. 2 Black and White Photographs, 2 Diagrams.
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Source:
Clinical & Experimental Immunology. Jan1991, Vol. 83 Issue 1, p4-9. 6p.
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Source:
Annual Review of Genetics. 1991, Vol. 25, p511-557. 47p.
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