In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Q:  This observation is consistent with the results of previous gel filtration and sedimentation equilibrium experiments , which suggested the presence of dimeric species of E . coli RdgC in solution ( 1 , 2 ) .
A: 
E . coli