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File:Keibel Mall 2 544.jpg ...imitive segments, at the level of the 13th segment. (Embryo {{Pfannenstiel III}}, from the collection of Professor Pfannenstiel; slide 11, row 3, section [[Category:Pfannensteil III]](971 × 1,093 (117 KB)) - 06:22, 15 November 2018