G. Top: distribution pattern of mRNAs clustered in k 2, k 5, k 7 and GAPDH. Bottom: smFISH co-detection of exemplar k7 / k 2 mRNAs and GAPDH in subconfluent motile HUVECs. arrows indicate orientation of RNA localisation; yellow dashed lines outline cell borders; red circles highlight smFISH spots; scale bars = 20 µm 