HOXD13 and Platelet storage pool disease: In the same codon of the same gene, the phenotype of R31 mutations in HOXD13 exhibited an interesting continuous phenotype: from unilateral to bilateral, from SD1-c phenotype to isolated 3/4 finger SPD and typical SPD (3/4 finger SPD and 4/5 toe SPD), from mild SPD to severe SPD and other phenotypes.