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URL: http://scholar.google.com/scholar_lookup?title=A+bone+marrow-derived+stroma+cell+line%2C+ST2%2C+can+support+the+differentiation+of+fetal+thymocytes+from+the+CD4%2B+CD8%2B+double+negative+to+the+CD4%2B+CD8%2B+double+positive+differentiation+stage+in+vitro&year=1999&author=Tong&journal=Immunology&volume=97&issue=4&pages=672-678&doi=10.1046%2Fj.1365-2567.1999.00822.x&pmid=10457222