Subtracting a vector is the same as adding a negative version of the vector (remember that making a vector negative means reversing its direction). \(\left( \begin{array}{l} a\\ b \end{array} ...

Our findings indicate that negative results obtained with subcloned DNA must be interpreted with caution and should motivate, if feasible, the use of linear, vector-free expression constructs in C.

Retroviruses are negative single-stranded RNA viruses in which tRNA serves as a primer for the ... of viral supernatant by transient transfection as well as assay for replication competent retrovirus.