PIPs cluster into two subgroups, PIP1 and PIP2, whilst TIPs cluster into 5 subgroups, TIP1, TIP2, TIP3, TIP4 and TIP5.
PIP-id on grupeeritud kaheks alamgrupiks: PIP1 ja PIP2, TIP-id aga viieks alamgrupiks: TIP1, TIP2, TIP3, TIP4 ja TIP5.