The example above Lysine and below Isoleucine shows the labeling configuration. for each amino acid 50% is M+3 as seen above and 50% is M +4 as seen above.
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Lysine * 2 HCl
Lysine * 1 HCl
Martek Isotopes LLC is proud to offer split mass amino acids, these are labeled in the backbone in a 50/50 mix of +3 and +4 mass differential.
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