Fig 4. Microarray-based comparative transcriptome demonstrating the gene expression (represented in log₁₀) for Porphyromonas gingivalis ATCC 33277 when growing in a multispecies biofilm compared to planktonic growth.

X-axis depicts the fold difference in gene expression of P. gingivalis in planktonic growth, and the Y-axis the gene expression of P. gingivalis inside a multispecies-biofilm. Up-regulated genes (over-expressed in multispecies-biofilm) were represented as red color and down-regulated genes were colored in green.