ɪn kˈɑːntɹæst, tˈuː tɹˈʌŋkeɪɾᵻd ˈaɪsəfˌɔːɹmz tˌiːkˈeɪ: tˈiː wˈʌn ænd tˈiː tˈuː pəzˈɛs ðə sˈeɪm ˌɛkstɹəsˈɛljʊlɚ dəmˈeɪn, tɹænsmˈɛmbɹeɪn dəmˈeɪn, ænd fˈɜːst twˈɛlv ˌɪntɹəsˈɛljʊlɚɹ ɐmˈiːnoʊ ˈæsɪd sˈiːkwənsᵻz æz tˌiːkˈeɪ plˈʌs.
In contrast, two truncated isoforms (TK-: T1 and T2) possess the same extracellular domain, transmembrane domain, and first 12 intracellular amino acid sequences as TK+.