Table 1. Post-radiation fold changes in phosphorylation at calpastatin serines 351 and 633.

Calpastatin Phospho-peptide	Phosphosite	Post-RT Time-point	OSU-2	OSU-11	OSU-20	U87	NHA
KPADDQDPIDAL[S]GDLDSCPSTTETSQNTAK	S633	30 s	5.0*	4.2	3.4*	−1.6	N/A
KPADDQDPIDAL[S]GDLDSCPSTTETSQNTAK	S633	4 h	6.3*	3.5	3.2*	−1.7	N/A
SESELIDEL[S]EDFDR	S351	30 s	2.2*	2.4	2.7*	1.6	N/A
SESELIDEL[S]EDFDR	S351	4 h	3.4*	3.4*	3.5*	2.0	N/A

Fold changes were calculated for each time-point (30 s/Untreated and 4 h/Untreated) from triplicate intensity values from mass spectrometry data. Asterisk indicates a p-value of < 0.05. N/A indicates that no calpastatin peptides were identified in NHA. The phosphorylated residue in the phospho-peptide is indicated in brackets.