FIG 4.

Prophage genes control pigmentation in PCC 7942. (A) Absorbance readings of spot cultures show that PCC 7942 loses phycocyanin and chlorophyll pigments over time compared to the phageless strain D1K3. (B) Loss of either Synpcc7942_0759 or Synpcc7942_0760 in section 7 of the prophage leads to a dark pigmentation phenotype similar to the phageless strain. (C) Expression of both Synpcc7942_0759 and Synpcc7942 _0760 together, but not Synpcc7942_0759 alone in the phageless strain, led to WT light pigmentation.