Sentence examples for only rarely observed from inspiring English sources

At the time of writing, we have been unable to identify any study of clinical material that has identified acquisition of a p53 mutation during treatment of a given patient and similarly gene amplification of MDR1, although widely observed in highly resistant cell lines, is only rarely observed following chemotherapy.

During our field work, signs of these activities were only rarely observed in the core zone.

These phenomena are expected from theory, but only rarely observed for complex samples such as semi-crystalline polymers.

Sub-micron belts are only rarely observed, but a few were spotted as shown in the inset in Fig. 2 b.

Detrital calcite is only rarely observed in coal as it can be easily decomposed in the acid environment of a peat mire (Kortenski 1992; Bouška et al. 2000).

Optically induced charge transfer between adsorbed molecules and a metal electrode was predicted by Hush to lead to new electronic absorption features, but has been only rarely observed experimentally.

Especially rheopilic species, such as A. aspius, B. barbus, S. cephalus and C. nasus, which were either absent or only rarely observed in the first sampling period, are now found regularly in the Rhine along this site.

Orally propagating WL contractions were only rarely observed.

Our data revealed frequent loss of chromosomes, but we only rarely observed heterozygozity.

In line with this assertion, we observed strongly lignified cells in vascular bundle tissue in cross sections of maize leaves infected with SG200Δtin2 and could only rarely observe fungal hyphae in bundle sheath cells.

We would argue that LTP on DRNs is unlikely to derive from IPCs because we only rarely observe LTP on one cell of the IPC cluster under conditions where it is reproducibly found on all DRNs.