Species rRNA Size (kb)
Human18S1.9
28S5.0
Mouse18S1.9
28S4.7
Drosophila18S2.0
28S4.1*
Tobacco Leaf16S1.5
18S1.9
23S2.9
25S3.7
Yeast18S2.0
26S3.8
E. coli16S1.5
23S2.9
Xenopus28S4.0
18S1.8

*Drosophila 28S rRNA is processed into 2 fragments that migrate in a similar manner to the 18S rRNA.