Sentence examples for but difficult to identify from inspiring English sources

For the location of PLN and PLMV relative to NIf and Av, it was simple to identify the vocal nuclei in singing animals using IEG expression (Fig. 7C), but difficult to identify by Nissl alone in the hopping animals.

Sequences were selected from the A. carterae EST project, largely from readily identified sequences with significant blast hits, but also including a mitochondrial gene (coxIII), and several highly expressed but difficult to identify genes such as an 'Ectocarpus silicosus virus' (ESV) like gene with a polysaccharide binding motif (Table 1).

The tightly ordered water molecules of the self-stabilized pentagon were already present in the 3EAM lower-resolution structure of GLIC but difficult to identify as they did not appear as individual spheres in the density but rather as a continuous crown.

Slowly-evolving but stable markers such as SNPs could be useful for this purpose, but are difficult to identify due to the monomorphic nature of North American isolates.

That study's lead author, Dr. Ingrid Helland of Oslo University Hospital, said that perhaps the benefit shown at age 4 existed at 7 but was difficult to identify amid other developmental factors.

Transient variations in physiological parameters may forewarn of life-threatening cardiac events, but are difficult to identify clinically.

These elements often lie in regions of protein disorder [12], [13] and are conserved in closely related species [14], but are difficult to identify due to their short length and degenerate composition.

Actinobaculum schaalii can cause urinary tract infections and septicemia but is difficult to identify by cultivation.

A slope transition was evident in C. rhomboidea at −1.90 MPa, but was difficult to identify in C. macleayana because minimum Ψmidday only fell to around −1.60 MPa.

In the tegu the Harderian glands were clearly evident in cross-sections but were difficult to identify in the CT images.

Environmental and other non-genetic factors, including nutrition, age of mother, viral diseases and chemical exposures, are also at play, but are difficult to identify.