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From Embryology
File:Streeter1957 fig08.jpg File:Streeter1957 fig08-19.jpg|[[Carnegie stage 19|stage 19]] (Embryo {{CE1390}}) File:Streeter1957 fig08-20.jpg|[[Carnegie stage 20|stage 20]] (Embryo {{CE6202}})(1,280 × 1,712 (507 KB)) - 10:16, 23 May 2017
