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Longitudinal imaging by OCT. (A) Cross sections of the same human heart organoid on different days. Scale bars: 200 μm. (B) Average heights and diameters of human heart organoids on different days. Solid lines represent averages, and shades represent standard deviations. n = 32 organoids. Brackets indicate linear growth phases I and II. Supplementary video 2 shows the 3D rendering of the hHO on different days.
