Hence, to define the repertoire of the CD8+ response in MDV infected birds, we isolated CD8+ T cell populations from a range of tumor sites and subjected them to spectratype and sequence based repertoire analysis (simultaneous analysis of CD4+ populations was used to determine the nature of the tumor profiles in these individuals, Figures S5, S6, S7, S8, and S9). Here, CD4 is linked to neoplasm.