Quantitatively precipitate any retrovirus with Retro-Concentin™. Instead of using lengthy spins in an ultracentrifuge, Retro-Concentin enables concentration of retroviruses directly from culture medium with a simple one (or an optional two) low-speed centrifugation steps. In addition, Retro-Concentin stabilizes the retroviruses for frozen storage, providing an additional advantage over other concentration methods. Each preparation can handle up to 200 mL of retroviral supernatant, which is compatible with most centrifuges, and the resulting pellet can be dissolved in the volume of buffer that meets your experimental requirements.