|<— LIPID =| ae
‘ ‘

1
; i

 

 

DISCRIMF/, '
> TRANS '
HORMONE D>, ror \i ANSDUCER \ AMPLIFIER
i ; .
cyc AMP
/K——— PLASMA MEMBRANE ———>|
outside inside

Fig. 3: Early 1970 representation of the hormone sensitive adenylyl cyclase
as a system formed of three functional elements: discriminator, transducer
and amplifier. (From Rodbell et al., 1970b)