Genomic organization and functional modules of phage S144. The inner circle shows the GC content (below average in purple, above average in ocher). Putative genes for phage morphogenesis are indicated as blue arrows (light blue: capsid, cyan: tail, blue: baseplate), genes for DNA packaging in green, lysis-associated genes in pink, genes involved in DNA manipulation in red, genes for nucleotide biosynthesis in purple and additional functions in ocher (prot. = protein). The middle circle indicates the promoters (orange arrows) and terminators (brown lines). Asterisks indicate the gene products identified in the proteomic analysis while the external ring highlights the identified clusters (from A to E).