On the question of obtaining the M-substance possessing antigenic properties from group A streptococci.
D000941:Antigens; D009930:Organic Chemicals; D013291:Streptococcus; D013297:Streptococcus pyogenes
D000941:Antigens; D009930:Organic Chemicals; C028349:substance M
ANTIGENS; STREPTOCOCCUS