Gel electrophoresis analysis of the 16S rRNA gene amplified with primers 530f and 1492r and with primers 27f and 1492r from extracellular and intracellular DNA extracted from sediment samples collected in the southern Pacific Ocean, in the deep western Mediterranean Sea, and in the Adriatic Sea. Lanes 1 and 10, DNA marker (100 bp; Promega); lanes 2 and 3, intracellular DNA from southern Pacific Ocean sediments; lanes 4 and 5, extracellular DNA from southern Pacific Ocean sediments; lanes 6 and 7, intracellular DNA from western Mediterranean Sea sediments; lanes 8 and 9, extracellular DNA from western Mediterranean Sea sediments; lanes 11 and 12, intracellular DNA from Adriatic Sea sediments; lanes 13 and 14, extracellular DNA from Adriatic Sea sediments.