Know your Amino Acids fact sheet:

Full name Lysine   
3 letter name Lys
1 letter name K
   
What you see: What a biochemist sees:
synmod-alt-11 Lysine-x
Speciality
Sources (animal) Meats, chicken, fish, eggs, milk
Sources (plant) Beans, quinoa, amaranth
   
Chemical formula C6H14N2O2
Essential X
Non-essential
   
Hydrophobic
Hydrophilic (neutral)
(positive) X
(negative)
   

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