The present invention aims to increase the number of polymorphism analyzes, which is the demerit of the MIG method. A primer comprising, in order from the 5-terminal end, (a) a region comprising a base sequence that another primer is annealed, (B) an incomplete SSR region, And (C) an anchor region, wherein the region (B) comprises a base sequence in which one or more bases are substituted in a base sequence in which 2, 7, 8 consecutive bases are repeated, and the region (C) comprises 1, 3 base sequences. Figure 1

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