Advantageous Uses of Mass Spectrometry for the Quantification of Proteins

Table 1

Amino acid substitutions in Apolipoprotein E Isoforms.

Isoform	Amino acid at; position 112	Amino acid at; position 158
Apo E2	Cys	Cys
Apo E3	Cys	Arg
Apo E4	Arg	Cys