The phrase "are already expressed" is correct and usable in written English.
It can be used when indicating that something has been stated or articulated previously.
Example: "The ideas we discussed in the meeting are already expressed in the report."
Alternatives: "have already been stated" or "are already articulated".
Later in G1, when these cyclins are already expressed, inhibition of cyclin expression can no longer prevent cell-cycle progression.
Thus, in HEK cells, it appears that ST increases DLL1 and JAG1 expression, which are already expressed in mesothelial cells.
However, all three factors are already expressed at E9.5, but Neurog2 expression is only initiated at E10.75 in the rostral floor plate.
These are probably due to the expression of multiple neurogenic genes that are already expressed in ASCs which might facilitate the neuronal induction process.
Some of these genes (16 genes, like Oct6, Lef1, Otx2, Wt1, Dnmt3a) are already expressed by reversibly committed cells suggesting that their sustained expression might be critical for the establishment of the differentiated state.
If a similar pattern exists in the expression profiles of other oviparous and viviparous squamate reptiles, it would suggest that the evolutionary transition to viviparity is relatively "easy" given that the necessary genes are already expressed in the uterus when not gravid/pregnant and only become modulated in their expression level rather reprogrammed.
Opposition candidates, meanwhile, are already expressing concern about fraud and are pointing to widespread irregularities in the voter registration.
Some officials and consumer groups are already expressing concerns that the partnership between government and industry could become too close.
Ecologists are already expressing concern that mass medication with omega-3 could wipe out global fish stocks, which are already under serious threat.
In the newsroom, editors and reporters are already expressing anxiety over whether they will get a fair share of the Internet bounty.
