C'est surtout utile pour les schémas en fait:
http://www.google.com/url?sa=t&source=web&cd=2&ved=0CCIQFjAB&url=http%3A%2F%2Fwww.uss-laos.org%2Fumvf%2Fpremannee2010%2Fbottari_serge%2Fbottari_serge_p01%2Fbottari_serge_p01.pdf&rct=j&q=d%C3%A9couverte%20prot%C3%A9ine%20G&ei=uoaMTrWYKcmf-wbCkr2dBA&usg=AFQjCNE4MBcvLyUCsH-FrmvypJVNfE8N_A&sig2=D_l8OgHStr-sPqs02yxMCg&cad=rja