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. 2016 Feb 17;6:21743. doi: 10.1038/srep21743

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(A) “W”-shaped neural canal (green triangle and yellow line); (B)“U”-shaped neural canal (green triangle and yellow line); (C) Measurement of NCO included RPEM (a1), RPEH (a2), BMOM (b1) and BMOH (b2); BMO (red triangle); terminal of RPE (yellow triangle).