. 2021 Nov 8;10:e67952. doi: 10.7554/eLife.67952

Table 2. Comparisons of relative ion intensities of characteristic fragment ions from an enzymatically di-acetylated and chemically propionylated H4(4–17) peptide, [M + 2 H]²⁺ = 762 Da, after activator and p300-mediated acetylation of chromatinized plasmids containing wild-type (wt) H4^*^_.

Species	Ion	% of Total ion intensity		Avg. ratio
K5ac, K8ac	b₅⁺	1.316	1.654	12.4
K5pr, K8pr	b₅⁺	0.072	0.253	12.4
K12ac, K16ac	y₉⁺	0.042	0.306	0.2
K12pr, K16pr	y₉⁺	3.176	0.971	0.2

Only two unique spectra were observed and analyzed for the doubly acetylated and propionylated H4(4–17) tail peptide from wild-type (wt) H4 chromatin.

Table 2. Comparisons of relative ion intensities of characteristic fragment ions from an enzymatically di-acetylated and chemically propionylated H4(4–17) peptide, [M + 2 H]2+ = 762 Da, after activator and p300-mediated acetylation of chromatinized plasmids containing wild-type (wt) H4*.

Table 2. Comparisons of relative ion intensities of characteristic fragment ions from an enzymatically di-acetylated and chemically propionylated H4(4–17) peptide, [M + 2 H]²⁺ = 762 Da, after activator and p300-mediated acetylation of chromatinized plasmids containing wild-type (wt) H4^*^_.