Discusses research being done on the role of leukotriene B[sub4]--an arachidonic-acid-derived pro-inflammatory lipid, in T-cell recruitment. Reference to a study by Vanessa Ott et al., published in the August 31, 2003 issue of "Nature Immunology"; Investigation on the response of CD8[sup+] T-cell subsets to leukotriene B[sub4].