user22057: When I tried to add the listed tag “replication” to a question I had edited on viral RNA-dependent RNA replicase I discovered it had become “DNA-replication”! Attempts to edit it again failed.
Why? and Why?

user5144: Simple answer: replication as a tag is a synonym for dna-replication. Entering a synonym makes the system to replace it by the main tag.
In the past it has only been used synonymous, so at one point the synonym was created. Look here for tag synonyms.

22057: <p>When I tried to add the listed tag “replication” to a <a href="https://biology.stackexchange.com/questions/100885/why-are-there-two-replicase-proteins-translated-from-tobacco-mosaic-virus-rna">question I had edited on viral RNA-dependent RNA replicase</a> I discovered it had become “DNA-replication”! Attempts to edit it again failed.</p>
<p>Why? and Why?</p>
 5144: <p>Simple answer: replication as a tag is a synonym for dna-replication. Entering a synonym makes the system to replace it by the main tag.
In the past it has only been used synonymous, so at one point the synonym was created. Look <a href="https://biology.stackexchange.com/tags/synonyms">here</a> for tag synonyms.</p>
