Table 1.

Mass spectrometry of IFNϵ and IFNκ

	Treatment	Observed mass	Expected massa	Deltab	Interpretation
IFNϵ	None	23,082	23,118	36
	IA	23,145	23,139	6	+ 1 IA
	IA + DTT	23,256	23,253	3	+ 3 IA
IFNκ	None	23,201	23,220	19
	IA	23,259	23,258	1	+ 1 IA
	IA + DTT	23,496	23,486	10	+ 5 IA

^a Calculated mass without N-terminal methionine.

^b Mass difference between expected and observed masses.