Figure 11. Amino acids that have a cationic (Arg, His and Lys), an anionic (Asp and Glu) and a partly anionic (Cys and Tyr) charge at physiologic pH (7.4). Charges are not shown on the formulas (Chemsketch templates)

From

Parallelism between the Classical Geocentric Cosmos and the Life Chemistry Essentials

Jef Struyf

American Journal of Educational Research. 2021, 9(1), 38-51 doi:10.12691/education-9-1-5