Mouse anti-Virus HRH4 monoclonal antibody for cI-ELISA. Penicillin (sometimes abbreviated PCN or pen) is a group of antibiotics derived from Penicillium fungi.[1] They include penicillin G, procaine penicillin, benzathine penicillin, and penicillin V. Penicillin antibiotics are historically significant because they are the first drugs that were effective against many previously serious diseases, such as syphilis, and infections caused by staphylococci and streptococci. Penicillins are still widely used today, though many types of bacteria are now resistant. All penicillins are ?-lactam antibiotics and are used in the treatment of bacterial infections caused by susceptible, usually Gram-positive, organisms.
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