(a). (b). PL2. PG. PL2. PG. PL1. PL1. PGP-Me. PGP-Me. S-DGD. S-DGD. GL3. GL2. GL1. 2nd. GLs. 1st. 1 2 3 4.
(a) (b) PL2 PG PL2 PG PL1 PL1 PGP-Me PGP-Me S-DGD S-DGD GL3 GL2 GL1 2nd GLs 1st 1 2 3 4