anionic ( no ( 3 ) ( - ) , br ( - ) , i ( - ) , and scn ( - ) ) and cationic ( zn ( ++ ) and cd ( ++ ) ) potentiators of the twitch output of skeletal muscle depress the active binding of ca by sarcoplasmic reticulum isolated from rabbit skeletal muscle .
C0003075
anionic
C0021966
i