There is one other BDNF receptor besides TrkB, called the "LNGFR" (for "low-affinity nerve growth factor receptor").
ðɛɹ ɪz wˈʌn ˈʌðɚ bˌiːdˌiːˌɛnˈɛf ɹᵻsˈɛptɚ bᵻsˌaɪdz tˌiːˌɑːɹkˈeɪ bˈiː, kˈɔːld ðə "ˌɛlˌɛndʒˈiːˌɛfˈɑːɹ" fɔːɹ "lˈoʊɐfˈɪnᵻɾi nˈɜːv ɡɹˈoʊθ fˈæktɚ ɹᵻsˈɛptɚ".