Table II. The number of peptides including a C-terminal arginine or lysine residue found in the different replicates, along with the ratio of the two. Clear difference is seen from WT towards Mutant (C351A) and ΔPPAD.

Sample	#Arginines	#Lysines	R/K
WT_2	314	1672	0.188
WT_3	287	1625	0.177
C351A_2	2140	2598	0.824
C351A_3	1881	2314	0.813
dPPAD_1	1368	1679	0.815
dPPAD_2	1321	1707	0.774