Chemotaxis

Chemotaxis can be defined as the growth or movement of motile organisms or cells guided by a chemical gradient. It can either be positive (towards the chemical) or negative (away from the chemical)^[1].

References:

1. ↑ http://www.ebi.ac.uk/QuickGO/GTerm?id=GO:0006935

http://www.ebi.ac.uk/QuickGO/GTerm?id=GO:0006935