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Table 2 Alignments available from the CRW Site. These alignments were used to generate conservation diagrams (rRNA only) and correspond to the alignments used in the nucleotide frequency tables.

From: The Comparative RNA Web (CRW) Site: an online database of comparative sequence and structure information for ribosomal, intron, and other RNAs

Molecule Alignment # of Sequences
rRNA (5S / 16S / 23S) T (Three Domains/Two Organelles) 686/6389/922
  3 (Three Phylogenetic Domains) -- / 5591 / 585
  A (Archaea) 53/171/39
  B (Bacteria) 323/4213/431
  C (Eukaryota chloroplast) -- / 127 / 52
  E (Eukaryota nuclear) 299/1937/115
  M (Eukaryota mitochondria) -- / 899 / 295
Group I Intron A (IA1, IA2, and IA3 subgroups) 82
  B (IB1, IB2, IB3, and IB4 subgroups) 72
  C (IC1 and IC2 subgroups) 305
  Z (IC3 subgroup) 125
  D (ID subgroup) 19
  E (IE subgroup) 46
  U (all other group I introns) 41
Group II Intron A (IIA subgroup) / B (IIB subgroup) 171/571
tRNA A (Alanine tRNAs) / C (Cysteine tRNAs) 64/19
  D (Aspartic Acid tRNAs) / E (Glutamic Acid tRNAs) 35/49
  F (Phenylalanine tRNAs) / G (Glycine tRNAs) 54/69
  H (Histidine tRNAs) / I (Isoleucine tRNAs) 38/56
  K (Lysine tRNAs) / M (Methionine tRNAs) 53/36
  N (Asparagine tRNAs) / P (Proline tRNAs) 35/55
  Q (Glutamine tRNAs) / R (Arginine tRNAs) 35/62
  T (Threonine tRNAs) / V (Valine tRNAs) 49/65
  W (Tryptophan tRNAs) / X (Methionine Initiator tRNAs) 30/65
  Y (Tyrosine tRNAs) / Z (All Type 1 tRNAs) 47 / 895