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Jyutping lok3 on1 syun1
Pinyin luò ān suān

Definitions (Wiktionary)
  1. noun, Mainland-China
    tyrosine
    (syn.) 酪胺酸

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Jyutping lok3 on1 syun1
Pinyin lào ān suān

Definitions (CC-CEDICT)
  1. tyrosine (Tyr), an amino acid
Definitions (Wiktionary)
  1. noun, Mainland-China
    tyrosine
    (syn.) 酪胺酸