Specific proteolytic activities of cathepsin B- and L-like in <i>T. urticae</i> after feeding for 7 days on single and double transformed lines and non-transformed control using specific substrates.

<p>Data, expressed as nmoles/min/mg, are mean ± SE of triplicate measurements of each sample. Different letters indicate significant differences (P<0.05, Student-Newman-Keuls test).