antibodies raised to a synthetic peptide corresponding to central , conserved sequences adjacent to the c-terminal sides of the pepsin cleavage sites in m5 , serotype 6 m protein , and serotype 24 m protein cross-reacted with heterologous acid-extracted m antigens but were not protective and did not bind to intact streptococcal cells , indicating that these epitopes are inaccessible on the intact cell surface .
C0003241
antibodies
C0700271
m protein