Fig. 2

The 2-dimensional (2D) CT and sequencing results of a 68 year old man with OPLL in the cervical spine. a The 2D CT showed the patient had OPLL (C2–C3, C4, C5, and C6, mixed type). bThe direct sequencing results of the PCR products showing the C/T heterozygous mutation of -349C > T polymorphism in BMPR-IA gene. A allele: green line; T allele: red line; C allele: blue line; G allele: black line