Figure 4: Expression of metalloproteases is unaltered in ticks upon feeding on immunocompetent or immunodeficient animals.

(A) QRT-PCR results showing levels of four arthropod metalloproteases [GenBank acc. nos. AY264367 (A), XM_002416249 (B), XM–002416250 (C) and XM_002412196 (D)], transcripts in ticks fed on immunocompetent (C57BL/6 J, closed circles) or immunodeficient (RAG−/−, open circles) animals. The mRNA levels for metalloproteases were normalized to tick beta-actin. Each circle represents one tick. Student’s t test values are shown.