adj, low*er  low*est   :  having a relatively less complex organization  :  not greatly differentiated or developed phylogenetically - usu. used in the comparative degree of less advanced types of plants and animals <the er vertebrates>  <an amino acid sequence that is related to that of myoglobin from two er eukaryotes -Malcolm Potts et al>  - compare HIGH1   .
 
 
 
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