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From Embryology
- [[File:Gray0458.jpg|thumb|alt=Historic image of early human vascular development|Historic image21 KB (2,924 words) - 09:45, 7 September 2017
- File:Gray0458.jpg|458 Diagram of the vascular channels in a human embryo of the second week27 KB (4,101 words) - 13:29, 1 April 2019