For example, in the diagram below ... The displacement and average velocity vectors point in the same direction. Any vector quantities can be added together like this. It doesn't matter if ...

This article examines viral and non-viral vectors in gene therapy, highlighting their mechanisms, advantages, and limitations ...

The diagrams show three examples of vectors, drawn to different scales. A measurement that doesn't have a direction is called a scalar. Scalar quantities only have a magnitude or size.

In perhaps the best known example, lentivirus-based vectors were instrumental to the development and recent approval of the chimeric antigen receptor (CAR) T cell therapy for a B-cell malignancy 1.