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Gen 2 - Inside Rockwell's innards if you follow the route down to the Heart where the final mission is, jump down and float to the bottom you should see what looks like a Stomach wall.. jump in collect the mutagel, i collected by hand as i just found it, BE warned Stomach acid starts to rise from the stomach wall and burns through armor, wait like 2 mins and it washes away, repeat.

Seems Rockwell has bad indigestion

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