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Experimental scheme for longitudinal assessment of brain development by high‐frequency ultrasound (HFUS): arrows indicate the number of embryos and gestational ages in days at which HFUS was performed for embryos that were analysed at multiple stages. Twenty‐two embryos were scanned at all three stages (E12.5, E16.5 and E18.5), 13 were scanned only at E16.5, and 18 were scanned at E16.5 and E18.5
