HomeNursing questions Amino acid used in Indole test.. Tryptophane publisher :NIL NAM -July 02, 2017 Amino acid used in Indole test: a. Tryptophane*** b. Cystin c. Phenylalanin d. Serin. Labels Nursing questions Facebook Twitter Share:Amino acid used in Indole test.. Tryptophane Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email