Global F2 genetic map of Medicago truncatula. The number above the linkage groups refers to the homologous linkage group in M. sativa . The code to the right of the linkage groups refers to the marker name. The numbers to the left of the linkage groups refers to the genetic distances (Kosambi cM) from the top and have been rounded up for clarity. The sign + indicates that two RAPD markers have been transformed into a codominant marker. In the case of codominant AFLP markers, the codes of the two bands are given together. Stars refer to known genes used for synteny studies. Circles refer to known genes not used for synteny studies.