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Cilia–cilia contact observed in adjacent ciliated high serum (10 % FBS) HMEC-1s, at confluence. From 39 cilia, 6 formed contacts (3 pairs). The intensity profile shows a reduction in intensity at the same location in both arl13b and 611b channels, indicating two separate cilia, not a single long cilia. The black line in RHS indicates the path of the intensity profile. Cilia–cilia contact was not observed in any other culture condition. See Additional file 1: Figure S3 for the other data
