1. Transitions to new concepts of gender
Michael Gross 
Current Biology 
Volume 26, Issue 4, Pages R141-R143 (February 2016)
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2. Non binary: The food writer Jack Monroe identifies as non-binary and transgender. (Photo: Tom Jackson.)
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3. Typecast: Many factors including the marketing of toys reinforce a binary system of stereotypical gender roles and appearances, which may cause distress to those who don’t identify with either gender or find themselves on the wrong side of the divide. (Photo: Mary Devane.)
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4. Pregnant meaning: The wide diversity of reproductive strategies in nature, including pregnant male seahorses, reminds us that our concept of gender is a cultural more than a natural phenomenon. (Photo: Joanne Merriam/Wikimedia Commons (CC-BY-SA 3.0).)
Current Biology  , R141-R143DOI: ( /j.cub )
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