404. That’s an error.

The requested URL /bookmarks/mark?op=add&bkmk=https%3A//mcb.asm.org/content/9/10/4119&title=Molecular%20cloning%20and%20sequencing%20of%20ama-1%2C%20the%20gene%20encoding%20the%20largest%20subunit%20of%20Caenorhabditis%20elegans%20RNA%20polymerase%20II. was not found on this server. That’s all we know.