The present invention relates to a fusion protein, comprising: (i) a first vascular endothelial growth factor (VEGF) isoform, and (ii) a second VEGF isoform, and (iii) a dimerization domain between the first isoform and the second isoform, wherein the first isoform and the second isoform are selected from VEGF121 and VEGF165.本發明係關於一種融合蛋白,包含:(i)第一血管內皮生長因子同功異形體,與(ii)第二血管內皮生長因子同功異形體,及(iii)介於該第一同功異形體與該第二同功異形體間的雙聚化功能域,其中該第一同功異形體及該第二同功異形體係選自VEGF121及VEGF165。