fetal_muscle_lower_limb rs7266768 4380585 PRNP chr20_4380000_4385000 chr20_4660000_4665000 fetal_muscle_lower_limb rs636920 4383588 PRNP chr20_4380000_4385000 chr20_4660000_4665000 pancreas rs628583 4386485 PRNP chr20_4385000_4390000 chr20_4660000_4665000 pancreas rs586446 4387134 PRNP chr20_4385000_4390000 chr20_4660000_4665000 pancreas rs602294 4388377 PRNP chr20_4385000_4390000 chr20_4660000_4665000