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The plain radiographs and sequencing results of a 62-year-old man with OPLL. a The plain radiographs showed patient had ossification of the posterior longitudinal ligament in the cervical spine (C2–C4, C5–C6, C7 mixed type). b The direct sequencing result of the PCR products showed the TG heterozygosis mutation of the Ser37Ala (T/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
