image: A.) When "naïve" virus-recognizing T lymphocytes encounter a virus, the cells get activated and expand dramatically in number. B.) van Heijst et al.'s paternity test for T lymphocytes measures the number of T lymphocyte families present and is thereby able to reveal whether the strength of a T lymphocyte response is determined by the number of T lymphocyte families participating, or the size of each of these families. This image relates to an article that appeared in the Sept. 4 issue of Science, published by AAAS. The study, by Dr. J.W.J. van Heijst at the Netherlands Cancer Institute in Amsterdam, Netherlands and colleagues, was titled, "Recruitment of Antigen-Specific CD8+ T Cells in Response to Infection is Markedly Efficient." view more
Credit: Image © <i>Science</i>/AAAS