Sentence examples for have never observed a from inspiring English sources

"Scientists have never observed a male.

I have never observed a case where stress was not one of the presenting factors".

We have performed similar experiments using this and other superoxide-generating systems under a variety of conditions and have never observed a reproducible difference between the wild type and sodCI sodCII double mutant.

Earlier studies using less differentiated cell for transplantation have found evidence of teratoma formation; by comparison, we have never observed a teratoma following transplantation in over 100 mice to date with photoreceptors derived from ES cells using our directed differentiation protocol.

Notably, we have never observed a clearly cell-autonomous pro-crossing phenotype caused by Robo2.

Since the authors have never observed a significant gender difference, age and smoking history were given priority over gender.

The problem is that, despite years of effort, researchers have never observed an electric field in a thunderstorm that is powerful enough to do this.

Having never observed a stable marriage close-up, she will have to guess how to make one work.

Fourth, we have never observed any particles that show a clear 180° reversal in the direction of their movement out of more than 3000 particle tracks analyzed, indicating that particles rarely switch between plus and minus end-directed motion.

However, the earlier experimental studies have never observed any Peierls-like structural instability in a wide temperature range.

We did not sequence the vector backbone of recombinant constructs, as we have never observed any compromised vector function.