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Attention to these other factors is necessary before we can begin to understand what LEH might signify in terms of ecological sources of physiological stress in non\u2010human primates. This study focuses on assessing the contribution of these other factors to variation in LEH expression within and across great ape taxa. Here, we present LEH data from unabraded crown regions in samples of seven great ape species. We analyze these data with respect to lateral enamel formation time and the angles that striae of Retzius make with the enamel surface, as these variables are expected to affect variation in LEH expression. We find that although the duration of enamel formation is associated with sex differences in LEH expression, it is not clearly related to taxonomic variation in LEH expression, and does not explain the low frequency of LEH in mountain gorillas found in this and a previous study. Our data on striae of Retzius angles suggest that these influence LEH expression along the tooth crown and may contribute to the consistently high frequencies of LEH seen in <jats:italic>Pongo<\/jats:italic> in this and previous studies. We suggest that future work aimed at understanding species variation in these angles is crucial to evaluating taxonomic patterns of LEH expression in great apes. Am J Phys Anthropol 148:191\u2013204, 2012. \u00a9 2012 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/ajpa.21619","type":"journal-article","created":{"date-parts":[[2012,5,21]],"date-time":"2012-05-21T05:52:49Z","timestamp":1337579569000},"page":"191-204","source":"Crossref","is-referenced-by-count":65,"title":["Linear enamel hypoplasia as an indicator of physiological stress in great apes: Reviewing the evidence in light of enamel growth variation"],"prefix":"10.1002","volume":"148","author":[{"given":"Debbie","family":"Guatelli\u2010Steinberg","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rebecca J.","family":"Ferrell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer","family":"Spence","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,5,21]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/335509a0"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.1051660306"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajpa.21182"},{"key":"e_1_2_6_5_1","volume-title":"Paleopathology at the origins of agriculture","author":"Cohen MN","year":"1984"},{"key":"e_1_2_6_6_1","volume-title":"Variations and diseases of the teeth of animals","author":"Colyer F","year":"1936"},{"key":"e_1_2_6_7_1","first-page":"699","article-title":"Chronological distribution of enamel hypoplasias and weaning in a Caribbean slave population","volume":"57","author":"Corruccini RS","year":"1985","journal-title":"Hum Biol"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajpa.10135"},{"key":"e_1_2_6_9_1","first-page":"213","article-title":"Assessment of enamel hypoplasia in a high status burial site","volume":"9","author":"Cucina A","year":"1997","journal-title":"Am J Phys Anthropol"},{"key":"e_1_2_6_10_1","article-title":"What is dental ecology?","author":"Cuozzo FP","journal-title":"Am J Phys Anthropol."},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajpa.1116"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajp.10106"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1017\/CBO9780511606397.004"},{"key":"e_1_2_6_14_1","first-page":"293","volume-title":"Recent contributions to the study of enamel developmental defects. 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