1 Cellular sexual dimorphism of X and Y homolog gene expression in human central nervous system during early male development Martin M Johansson 1,* , Elin Lundin 2,* , Mohammadreza Mirzazadeh 1 , Xiaoyan Qian 2 , Jonatan Halvardson 3 , Elisabeth Darj 4 , Lars Feuk 3 , Mats Nilsson 2§ and Elena Jazin 1,§ 1 Department of Organismal Biology, EBC, Uppsala University, Sweden 2 Department of Biochemistry and Biophysics, Stockholm University, Sweden 3 Department of Immunology, Genetics and Pathology, Uppsala University, Sweden 4 Department of Women's and Children's Health, International Maternal and Child Health (IMCH), Uppsala University, Sweden. Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway * These authors contributed equally to this work. § Corresponding authors: elena.jazin@ebc.uu.se, mats.nilsson@scilifelab.se Keywords: Sex differences, human embryo development, female, male, gene expression, protocadherin, neuroligin, X chromosome, Y chromosome, brain, spinal cord, cortex, medulla oblongata, rolling circle amplification, PCDH11X, PCDH11Y, NLGN4X, NLGN4Y, ISLET1, OLIG2, SOX10, NeuN