Table 6.
G/U | ||||||
---|---|---|---|---|---|---|
A/U or G/C | Loop | Total G/U | Case 0 | Case 1 | Case 2 | |
Theoretical | 0.607 | 0.298 | 0.095 | 0.050 | 0.022 | 0.022 |
Observed | 0.349 | 0.600 | 0.052 | 0.034 | 0.009 | 0.008 |
Observed/theoretical | 0.574 | 2.012 | 0.546 | 0.688 | 0.417 | 0.358 |
The proportion of nucleotides involved in A/U or G/C base pairs, G/U pairs, and loops in the PSTVd secondary structure (Theoretical) are compared with the proportion of substitutions detected at these nucleotides (Observed) in the sequenced population derived from a cloned Master sequence. Substitution frequencies for G/U nucleotides in different contexts (Case 0, Case 1 and Case 2) are also indicated.