The phrase "a stage when only" is correct and usable in written English.
It can be used to describe a specific point in time or condition where something is limited to a particular situation or factor.
Example: "We are currently at a stage when only the most qualified candidates will be considered for the position."
Alternatives: "a phase where only" or "a point in time when only".
A disturbance on a single cell may induce an abnormal development at the zygote (one-cell) stage, the blastocyst stage (when only a few cells in the inner cell mass are embryo progenitors), or during organogenesis, when organ rudiments may consist of only few cells.
At this stage, when only a few ultimobranchial cells expressed Nkx2-1, it was evident that Foxa2 was specifically downregulated in the entire pouch domain of the endoderm (Fig. 4E,F).
The same Barcelona that Hiddink's Chelsea had come so close to putting out at the semi-final stage, when only some extraordinary refereeing decisions and a stoppage-time equaliser earned Pep Guardiola's team passage to the final on an infamous night in London.
We used zebrafish at the embryo stage, when only innate immunity is functional, as an in vivo model to study the role of miR-146 during bacterial infection.
The significant structural changes are absent during the relaxation stage, when only minor topological coarsening effects remain and stresses can relax in an almost invariant microstructure.
His mother died of colon cancer in 1977, being diagnosed at a stage when she only had a few months to live.
In fact, it's getting to a stage when the only time it makes sense to buy supermarket wine is when it's on promotion, be that a discount on a specific line or, better still, a 25% across-the-board deal when you buy in quantity (usually a minimum of six bottles).
1– 3 One possible explanation of these failures is that a treatment targeting A β deposition, an early-stage process, may have little effect on patients in later stages when only a weak correlation between plaques and cognition remains.
Likewise, for RT-qPCR, increased inter-run and intra-run variation was observed for low abundance transcripts due to stochastic variation in both RT and qPCR stages when only a small number of molecules is present in each reaction [ 17].
Therefore, depending on the stage of the pathology, a given locomotor test might be the most indicated in terms of sensitivity: heel and toe walking at initial stages, when only distal muscles are involved, step ascending and descending, at a more advanced stage, when also proximal muscles might be affected.
