P2RY12 and stroke disorder: Direct sequencing was used to screen these three stroke subtypes and non-stroke controls for <i>P2Y12</i> polymorphisms: a T→C transition at 744 nucleotides (nt) downstream of intron 5's start site (<i>i-T744C</i>) and a C→T transition at 34 nt downstream of exon 2's start site (<i>C34T</i>).