In the past I used a series of cultures to demonstrate cross feeding in
serratia for my genetics class. I have lost the reference and wonder if
anyone knows which strains are necessary (they included 9-3-3, WF, HY
and about 5 others). They were all mutant for some enzymes in the
production of a red or purple pigment. I can't seem to find a reference
to these strain names in ATCC. Any help is appreciated.