Table 1

MicroRNA gene products in Caenorhabditis elegans.

Gene	Source^*	Orthologs^†Expression^‡^§^\|	Develop-ment^¶
mir-1	cDNA	C^‡ ^§ ^\|Dm^‡Hs^‡	Unif
mir-2	cDNA	C^‡ ^§ ^\|Dm^‡	L1
mir-42	cDNA	C^‡ ^\|	L1
mir-43	cDNA	C^‡ ^§ ^\|	L1
mir-52	cDNA	C^‡ ^§ ^\|	L1
mir-58	cDNA	C^‡ ^\|	Unif
mir-60	cDNA/In	C^\|	L1
mir-62	cDNA	C^‡ ^§ ^\|	L1
mir-72	cDNA	C^‡ ^\|	L1
mir-80	cDNA	C^‡ ^§ ^\|	Unif
mir-81	cDNA	C^‡ ^\|	L1
mir-87	cDNA	C^‡ ^§ ^\|Dm Hs	L1
mir-88	In	C^\|	Unif
mir-89	In	C^\|	NT
mir-90	cDNA	C^‡ ^\|	L1

↵* Identified by screening a size-selected cDNA library (cDNA) or by informatics (In).
↵† Predicted by BLAST (15) and mfold (11, 12). C, C. elegans; Dm,Drosophila melanogaster; Hs, Homo sapiens.
↵‡ Expression of an ∼22-nt RNA confirmed by Northern blot.
↵§ The ∼22-nt transcript confirmed to be single-stranded using probes to both ends of the predicted stem loop.
↵| Expression of an ∼65-nt predicted stem-loop RNA confirmed by northern blot.
↵¶ Stage of C. eleganslarval development (L1 through L4) when the indicated transcript(s) appear most abundant. Unif, uniform expression; less than twofold change in level; NT, developmental profile not tested.