Fig. 2.

The 2-dimensional (2D)-computerized tomography (CT) and sequencing results of a 50-year-old woman with OPLL. a The 2D-CT showed patient had ossification of the posterior longitudinal ligament in the cervical spine (C2–C3, C4, C5–C6 mixed type). b The direct sequencing result of the PCR products showed the AG heterozygosis mutation of the Ser87ser (A/G) polymorphism in exon 2 of the BMP-2 gene. A allele: green line; T allele: red line; C allele: blue line; G allele: black line