The phrase "allowed to observe an" is correct and usable in written English.
It can be used in contexts where permission is granted to watch or monitor something or someone.
Example: "As part of the training program, participants are allowed to observe an experienced technician at work."
Alternatives: "permitted to watch a" or "granted access to view a".
In a previous study [8] six subjects (observers) were allowed to observe a conspecific model opening the plastic box in a peculiar way (mouth-opening) before they were tested individually.
At a presentation attended by Prince Charles, David Thomson is allowed to observe: "A visitor from another planet, advised on how to recognize modern royalty..
Whereas some areas appeared unperfused on FA (Fig. 4a), magnified confocal imaging allowed to observe a strong superficial cellular infiltration leading to a vascular sprout lay in the lower capillary bed.
Double staining of these cells for tTG and the recycling endosomal marker Rab11, the late endosomal marker Rab7, and the lysosomal marker Lamp1, allowed to observe a substantial colocalization of tTG with Rab11 on a subset of perinuclear vesicles (Fig. 3C), whereas little codistribution of tTG with Rab7 or Lamp1 was found (Fig. S3C).
Biochemical analysis of biological fluids performed 14 days after MIA injection, allowed to observe a 4 fold increase of CTX-II in plasma of MIA + vehicle rats compared to the control group (vehicle + vehicle).
Freshly obtained and separated CD34−/CD105+ early erythroid cells, evaluated for their gene expression profile in comparison with the CD34+ common progenitor compartment, allowed to observe a high number of differentially regulated genes.
The serial monitoring of the DNA and RNA JAK2V617F mutational ratios and the JAK2V617F expression levels normalized with GUSB allowed to observe a significant increase of the JAK2V617F expression levels at PV progression in two of the three cases (case 1 and 3, Fig. 6c) and a trend toward statistical significance in the remaining case.
The nature of the archive is temporally and spatially highly discontinuous but allows to observe a systematic drop in phreatic groundwater levels during the second half of the 19th century.
Indeed, microscopy multiphoton allows to observe a first fluorescent marker via 2 photon-excitation-fluorescence and to visualize collagen without marking with SHG (Werkmeister et al. 2008).
In summary, addition of large amount of exogenous RNA allows to observe a radiolabelled RNA with the same size as the added RNA.
