A new penicillium mutant was tested for auxotrophy. the mutant grows on minimal medium (m) +arginine (a) + proline (p) + histidine (h) but not on m or on m +a+h

It is an Proline Auxotroph Mutant. It requires Proline to grow. The non-naturally occurring proline auxotroph, wherein the proline auxotroph is a methanotrophic microorganism com...