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Quail heart imaged with optical coherence tomography (OCT) over looping heart stages. The pictures show normal cardiac morphological changes from 40 to 64 h of incubation (approximately HH11 to HH17), and the rightwards looping of the heart. Red (Endo): Endocardium; Blue (Myo): Myocardium. A: anterior; P: posterior; R: right; L: left. Reproduced with permission from [167].
