The phrase "an opposite role" is correct and usable in written English.
It can be used when discussing a character or person's function that contrasts with another's in a narrative or situation.
Example: "In this play, the actor takes on an opposite role to highlight the protagonist's flaws."
Alternatives: "a contrasting role" or "a reverse role".
And the other will take on an opposite role, a camp assistant director to Tom Hardy's incomprehensible Bane in The Dark Knight Rises, say.
When the density is about 1550 kg/m3, scoria concrete plays an opposite role in the resistance compared with that of ordinary concretes.
However, HCl treatment decreases active acidic groups and increases the inactive groups, playing an opposite role in the catalyst dispersion and catalytic activity.
While the strain gradient size dependency plays an opposite role which causes that the influence of the type of lipid micro/nano-tubule on its natural frequency corresponding to the prebuckling and postbuckling domains increases and decreases, respectively.
However, in the developing IFM, our data point to an opposite role.
However, several studies also suggested an opposite role of MeCP2 on regulating a diversity of genes as a transcriptional activator [69] [71].
In addition, inhibition of MAPK signaling by the specific inhibitors (PD98059, ERK inhibitor; SB203580, p38 inhibitor; SP600125, JNK inhibitor) protected cells from the cytotoxic effects of GBT, suggesting that activation of MAPK cascades play a opposite role in A431 cell proliferation.
Taken together, the present study shows that p38 MAPK is a key signaling molecule that plays a significantly opposite role during times of cellular growth and cellular stress, which may account for the differing rates of wound closure seen in diabetic populations.
"The Comedy" stars Tim Heidecker in a diametrically opposite role — the man who can't escape himself — which renders his caustic barrage of outrageous, often uproarious humor surprisingly poignant.
In addition to this proinflammatory function in immune cells, we have recently demonstrated that TAK1 has a completely opposite role in the skin and intestinal epithelium.
Furthermore, LTC4-induced activation of CysLT2R has been shown to promote differentiation of colon cancer cells [15], which suggests a potentially opposite role for the CysLT2R compared to the CysLT1R in the development or progression of colon cancer.
