Source: 1955-1974 (Imaizumi and Inouye, 1979); 1975-1994 (Imaizumi and Nonaka, 1997); 1995-1998 (Imaizumi, 2003), and 1999-2008 (present study)
Source: 1955-1974 (Imaizumi and Inouye, 1979); 1975-1994 (Imaizumi and Nonaka, 1997); 1995-1998 (Imaizumi, 2003), and 1999-2008 (present study) |
| Figure 2: Yearly change of MZ and DZ twinning rates, 1955-1967and 1974-2008. |
