The www.bio-protocol.org (originally from Stanford Univerisity) aims to provide life science researchers with a comprehensive collection of experimental protocols free of charge. Each protocol published on the website bears high standards in quality and provides accurate and detailed guidance which allows even rookie researchers to easily repeat experiments. Contribution to www.bio-protocol.org is by invitation only to maintain the quality of the protocols. The invitations are issued by their editorial board to experts from elite universities and research institutions. The invited authors can only contribute protocols that he or she has personally carried out with success. Registration not required.