Tüysüz, B., Tolun, A., Yıldırım, Y., “Response to Kouwenberg et al. ~Recognizable phenotype with common occurrence of microcephaly, psychomotor retardation, but no spontaneous bone fractures in arcl2b due to pycr1 mutations~”, American Journal of Medical Genetics Part A, 155A, 9, 2333-2334, 2011.