Files in this Data Supplement:

• Supplemental file 1 - Denaturing gradient gel fingerprint of bacterial communities associated with Ircinia strobilina (Fig. S1); rarefaction curves of bacterial 16S rRNA gene clones from I. strobilina (Fig. S2); stacked ion chromatograms of organic extracts of I. strobilina sponges (Fig. S3).
  PDF file, 431K.
• Supplemental file 2 - Numbers and names of clones in each tetragon of the phylogenetic tree shown in Fig. 3 (Table S1).
  MS Word document, 93K.