21. The mouse homologue is found on chromosome 2. 22. The 16S rRNA is the mitochondrial homologue of the eukaryotic nuclear 28S ribosomal RNAs. 23. It is closely related to pyrovalerone, being simply its chain-shortened homologue . 24. Difluoromescaline and trifluoromescaline are more potent than mescaline, as is its amphetamine homologue trimethoxyamphetamine. 25. The homologue of this snoRNA in " Arabidopsis thaliana " is called snoZ153. 26. One such homologue has already been identified : OSBS from " Amycolatopsis ." 27. The closest homologue that has a known structure is the " E . coli" 28. Dis1 is the preferred homologue in colder temperatures, while alp14 is preferred in higher temperatures. 29. The structure of TEP1 and its vertebrate homologue -complement protein C3-is mostly conserved. 30. A cyanobacterial homologue can transport nitrate.