 branch denotes the genetic distance (e.g., number of substitutions per unit time) between the two taxa it connects.</span> lengths in the active tree (MEGA 
 provides options to pre-compute branch lengths (e.g. using the <u style="text-underline: double;"><a 
	 href="Part_I_Getting_Started/A_Walk_Through_MEGA/Constructing_a_Timetree_(ML).htm" 
	 style="color: #007fbf; font-family: Arial, sans-serif; font-size: 12pt;">likelihood-based 
 tool</a>)</u><span style="display: none;">Constructing_a_Time_Tree_ML_<