On 2014 May 23, Morgan Price commented:

The claim that cross-feeding of amino acids is common is based on auxotroph predictions, but I suspect that most of the auxotroph predictions are incorrect. For example, I examined the IMG pages for four bacteria that my colleagues have been working with -- Shewanella oneidensis MR-1, Zymomonas mobilis ZM4, Desulfovibrio alaskensis G20, and Pseudomonas stutzeri RCH2. All of them grow in defined media without any added amino acids, and yet the IMG web site predicts that each is auxotrophic for 5 or more different amino acids.

On 2014 May 23, Morgan Price commented:

The claim that cross-feeding of amino acids is common is based on auxotroph predictions, but I suspect that most of the auxotroph predictions are incorrect. For example, I examined the IMG pages for four bacteria that my colleagues have been working with -- Shewanella oneidensis MR-1, Zymomonas mobilis ZM4, Desulfovibrio alaskensis G20, and Pseudomonas stutzeri RCH2. All of them grow in defined media without any added amino acids, and yet the IMG web site predicts that each is auxotrophic for 5 or more different amino acids.