Menlo Photo Bank:
PZ20121030-002.jpg
micheleguieu:
IMG_1436
Jeremy Brooks:
Crutchjacked
fredcamino:
Mom and child wait for the 38 in the makeshift bus benches.
fredcamino:
DSCN4188.JPG
California Institute for Regenerative Medicine:
Smooth muscle cells derived from mouse neural crest stem cells