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Representative second harmonic generation (SHG) images with quantification of collagen fractions (bottom graphs) in ipsilateral primary tumours (left lungs) and contralateral (right) lungs at day 17, formed by H1299control or H1299RASSF1A re‐expressing cells. Scale bars: 50 μm. Statistical analyses were performed using 2‐tailed Student's t‐test. Error bars represent SEM.
