An abundance in the core region of the phosphorylated compounds 2-keto-3-deoxyoctonoate and L-glycero-D-mannoheptose may be used to render the namesake classification in varieties like Pseudomonas and Yersinia.  
They may be classified further by the chemical composition of their somatic or O-antigen determinants. An abundance in the core region of the phosphorylated compounds 2-keto-3-deoxyoctonoate and L-glycero-D-mannoheptose may be used to render the namesake classification in varieties like Pseudomonas and Yersinia.  However, their chief distinguishing feature is the depletion in peptidoglycans observed in their double membranes. FTP, name these bacteria whose cell walls trap safranine, but allow the primary crystal-violet to escape upon addition of acetone, causing them to appear red in the namesake stain.
They may be classified further by the chemical composition of their somatic or O-antigen determinants.
Gram Negative bacteria or G-minus bacteria