Fig. 1

a Illustration of the score of a candidate median gene. b Gene similarity graph of three genomes G, H, and I. Colored components indicate candidate median genes \(m_1 = (g_1, h_1, i_2)\), \(m_2 = (g_2, h_2, i_1)\), \(m_3 = (g_3, h_3, i_2)\), and \(m_4 = (g_4, h_3, i_3)\). Median gene pairs \(m_1, m_3\) and \(m_3, m_4\) are conflicting