ðɪs pɹˈoʊtiːn ɪz ɹˈɪtʃ ɪn tɹˈɪptɑːfən ɹˈɛsɪdˌuːz wˌɪtʃ ɑːɹ ɐ pɹɪkˈɜːsɚ tə sˌɛɹətˈoʊnɪn, ɐ nˈʊɹɹətɹˌænsmɪɾɚɹ ɐsˈoʊsɪˌeɪɾᵻd wɪð pˈɑːzᵻtˌɪv mˈuːdz.
This protein is rich in Tryptophan residues which are a precursor to serotonin, a neurotransmitter associated with positive moods.