<prompt> Gadzira shanduro yakaoma zvikuru yemutsara uyu Mhando dzeMT 1 kana Mel 1a kana MTNR1A uye MT 2 kana Mel 1b kana MTNR1B receptors dziripo muvanhu nedzimwe mhuka dzinoyamwisa.  <response>: Chokwadi, shanduro yakaoma kunzwisisa yemutsara uyu ndeiyi The MT 1 kana Mel 1a kana MTNR1A uye MT 2 kana Mel 1b kana MTNR1B receptors subtypes are present in humans and other mammals, while an additional melatonin receptor subtype Mel 1c has been identified in amphibia and birds. 