alameda
beaten path
beaten track
berm
bicycle path
boardwalk
bridle path
catwalk
esplanade
fastwalk
foot pavement
footpath
footway
garden path
groove
hiking trail
mall
parade
path
prado
promenade
public walk
run
runway
rut
sidewalk
towing path
towpath
track
trail
trottoir
walk
walkway
Gene
activation
aspect
avenue
barrier
cell
channel
circuit
component
environment
enzyme
factor
lane
mechanism
molecule
protein
receptors
response
route