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(Molecular Evolutionary Genetics Analysis (MEGA) is computer software for conducting statistical analysis of molecular evolution and for constructing phylogenetic trees. It includes many sophisticated methods and tools for phylogenomics and phylomedicine. It is licensed as proprietary freeware. The project for developing this software was initiated by the leadership of Masatoshi Nei in his laboratory at the Pennsylvania State University in collaboration with his graduate student Sudhir Kumar and postdoctoral fellow Koichiro Tamura.[2] Nei wrote a monograph (pp. 130) outlining the scope of the software and presenting new statistical methods that were included in MEGA. The entire set of computer programs was written by Kumar and Tamura. The personal computers then lacked the ability to send the monograph and software electronically, so they were delivered by postal mail. From the start, MEGA was intended to be easy-to-use and include solid statistical methods only. MEGA version 2 (MEGA2), which was coauthored by an additional investigator Ingrid Jakobson, was released in 2001.[3] All the computer programs and the readme files of this version could be sent electronically due to advances in computer technology. Around this time, the leadership of the MEGA project was taken over by Kumar (now at Temple University) and Tamura (now at Tokyo Metropolitan University). The monograph Molecular Evolutionary Genetics Analysis was often used as a textbook for new ways to study molecular evolutionMEGA has been updated and expanded several times and currently all these versions are available from the MEGA website. The latest release, MEGA7, has been optimized for use on 64-bit computing systems. MEGA is in two version. A graphical user interface is available as a native Microsoft Windows program. A command line version, MEGA-Computing Core (MEGA-CC), is available for native cross-platform operation. The method is widely used and cited. With millions of downloads across the releases, MEGA is cited in more than 85,000 papers. The 5th version has been cited over 25,000 times in 4 years.[Alignment Editor ― Within MEGA, the Alignment Editor is a tool that may be used for editing and building multiple sequence alignments. The Alignment Editor in MEGA includes an integrated tool for both ClustalW and MUSCLE programs. All actions take place in the Analysis Explorer, which can be found in the main menu of MEGA. When a new alignment is being created, the user is presented with three options: create a new alignment, open a saved alignment session, or retrieve sequences from a file (importing sequences from NCBI). Once an option is selected, the user can choose either ClustalW or MUSCLE from the Alignment tab located at the top of the page. Parameters for the selected alignment program can then be specified and a progress bar will appear while the tool is being computer. Aligned sequences will replace unaligned ones in the main section of the Alignment Editor. To perform further analysis in MEGA, it is advisable to save the alignment session in either MEGA or FASTA format.[Trace Data File Viewer/Editor ― The Trace Data File Viewer/Editor has many functionalities in the following three menus. All the commands are used to help specialize searches and alignments in MEGA.Data Menu consists of Open File in New Window, Open File, Save File, Print, Add to Alignment Explore, Export FASTA File, and Exit.[13] Edit Menu consists of Undo, Copy, Mask Upstream, Mask Downstream, and Reverse Complement. The difference between Mask Upstream and Mask Downstream is upstream is used to mask/unmask a region to the left of a cursor while downstream does the opposite. Reverse Complement will be used in situations where the complements may need to be reversed in a sequence.[13] Search Menu consists of Find, Find Next, Find Previous, Next N, Find in File, and DO BLAST Search. The Find, Find Next, and Find Previous are used to find occurrences in certain sections of a query sequence. Next N is a command the will be able to go to the next indeterminate (N) nucleotide. Find in a File allows a user to search another file for selected sequences. Do BLAST Search command will perform a BLAST search in a separate web browser. The user may be able to either select certain date to BLAST or all sequences in the session will be used. Integrated web browser, sequence fetching ― MEGA comes with a built-in web browser that allows users to access GenBank sequence data from the NCBI website. The integrated web browser can be accessed when creating a new alignment in the Alignment Editor. To successfully use sequences from NCBI, it is advised to change the searches to FASTA format and use the “Add to Alignment” button. Once completed, all the sequences will be imported into the MEGA application.)