An Isolate of Streptococcus Pneumoniae from a Patient with Meningitis

An isolate of Streptococcus pneumoniae from a patient with meningitis is incubated with low-dose radiolabeled ceftriaxone and then subjected to protein electrophoresis.  Five distinct bands are detected by radioautography.
These bands most likely represent radiolabeled ceftriaxone that is bound to which of the following?

A) Cell wall glycoproteins
B) DNA replication proteins
C) Porins
D) Ribosomal proteins
E) Transpeptidases

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