A mixture of polymers optimized for the precipitation of lentiviral particles, the Lentivirus Precipitation Solution from Alstem provides a rapid, efficient method for concentrating lentiviral particles. Laboratorians can mix a lentiviral supernatant with the Lentivirus Precipitation Solution, incubate for a short period, and spin the mixture in a standard centrifuge, increasing lentivirus titer by up to 100 fold in as little as 4 hours. No ultracentrifugation is required, and the solution is scalable for use with large volumes. The Lentivirus Precipitation Solution is a 5x solution and safe for all cell lines, including ES cells. For more information, visit Alstem.