Fig. 1
From: The role of long non-coding RNAs in the pathogenesis of hereditary diseases
The organization and normal expression pattern of imprinted regions. Arrows indicate active promoters and direction of transcription. The paternal chromosome is marked in blue, in red – the maternal. Methylated imprinting center is indicated by a shaded circle. a - SNRPN-UBE3A region 15q11-q13. b – KCNQ1; IGF2/H19 region 11p15. c – GNAS region20q13.3