Inositol pyro/polyphosphate pathways showing [PSI+]-supporting (green arrows) and [PSI+]-inhibiting (red symbol) species (modified from Ref. 131).
IP3, inositol 1,4,5-trisphosphate; IP4, inositol tetrakisphosphate; 5PP-IP5, 5-diphosphoinositol pentakisphosphate; IP6, inositol 1,2,3,4,5,6-hexakisphosphate.