TRBC1 and infection: To better understand the molecular requirements for TCRβ expression and the immune effector mechanisms induced by TCRβ expression, we compared the transcriptome by microarray of TCRβ+ versus TCRβ− Ly6G−CD11bhighF4/80+CD3ε−CD4−CD8− macrophages sorted from splenocytes of pooled mice on day 3 post-infection with Pb−A.