The document summarizes a study that classified mycobacteriophages (viruses that infect mycobacteria) isolated from soils in Puerto Rico into genomic clusters. The researchers used polymerase chain reaction and gel electrophoresis to amplify and compare the phage genomes. They determined that three phages (Bruce, Cemi, and Lorenzoveg) belonged to Cluster B2, while one phage (Fenixious) was classified in Cluster E, matching the control phage Lilac. The clustering was based on the phages sharing similar genomic characteristics and migration patterns in gel electrophoresis.