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       As Embryo #836 is one of the best examples in the Carnegie collection 
        it has been the subject of many studies. Several reconstructions were 
        made by Osborne O. Heard and H. M. Evans, using methods developed by Gustav 
        Born. 
      These models have been used in studies of embryonic development and are 
        illustrated in the monograph "Developmental Stages in Human Embryos", 
        by Ronan O'Rahilly and Fabiola Müller. 
          
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