sˈɑːɹɡɹɐmˌoʊstɪm ɪz ɐ ɹˌiːkˈɑːmbɪnənt vˈɜːʒən ʌv dʒˌiːˈɛmsˌiːˌɛsˈɛf, wˌɪtʃ ɪz ɐ ɡlˈaɪkəpɹˌoʊtiːn mˌeɪd ʌv wˈʌnhˈʌndɹɪd twˈɛnti sˈɛvən ɐmˈiːnoʊ ˈæsɪdz; sˈɑːɹɡɹɐmˌoʊstɪm ɪz mˈɪkstʃɚɹ ʌv θɹˈiː vˈɜːʒənz ʌv dʒˌiːˈɛmsˌiːˌɛsˈɛf ðæt hæv məlˈɛkjʊlɚ wˈeɪts ʌv nˈaɪntiːn,fˈaɪvhˈʌndɹɪd, sˈɪkstiːn,ˈeɪthˈʌndɹɪd ænd fˈɪftiːn,fˈaɪvhˈʌndɹɪd dˈɔltənz.
Sargramostim is a recombinant version of GM-CSF, which is a glycoprotein made of 127 amino acids; sargramostim is mixture of three versions of GM-CSF that have molecular weights of 19,500, 16,800 and 15,500 Daltons.