Vectors are equal if they have the same magnitude and direction regardless of where they are. Triangle ABC is isosceles. X is the midpoint of AB, Y is the midpoint of BC and Z is the midpoint of AC.

Vectors are equal if they have the same magnitude and direction regardless of where they are. Triangle ABC is isosceles. X is the midpoint of AB, Y is the midpoint of BC and Z is the midpoint of AC.

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.