Table 9 2×2 contingency table for Fisher’s Exact Test for N-terminal- and C-terminal-enriched mass shifts

N _Xt(s)

N _{Xt, mod}(s)

N _{Xt, unmod}(s)

N _non−Xt(s)

N _{non−Xt, mod}(s)

N _{non−Xt, unmod}(s)