A format statement contains one or more command statements. A command statement contains a command and a valid setting keyword (command=keyword format). For example, the command statement DataType=Nucleotide tells MEGA that nucleotide sequence data is contained in the file. Based on the DataType setting, different types of keywords are valid.
Keywords for Sequence DataRH_Keywords_for_Format_Statement_Sequence_data
Keywords for Distance DataRH_Keywords_for_Format_Statement_Distance_data