The phrase "mainly unclear" is correct and can be used in written English.
It is typically used to describe something that is not completely clear or understandable, but not completely unclear either. It indicates that there is some level of uncertainty or ambiguity. Example: The instructions for assembling the furniture were mainly unclear, causing me to make several mistakes during the process.
For transduction modulators as well as cellular calcium affecting agents mechanisms are mainly unclear or controversial.
C. neoformans AD hybrid isolates are known to result from hybridization of serotype A and serotype D genomes; however, the genome organization of serotype AD strains is mainly unclear.
Although there are some data showing that unknown genetic etiologies of placenta are thought to be the cause of many types of pregnancy complications such as unexplained miscarriage, intrauterine growth retardation, pre-eclampsia (PE) and so on, the molecular basis of human placentation remains mainly unclear.
In nitrogen-limited environments, APP displays a distinct competitive advantage (Raven 1998); however, the APP responses to seasonal changes in coastal systems remain unclear, mainly because there is limited documentation of the annual cycle.
However, whether a high focus on prophylactic treatment during the first year could prevent a suggested high relapse rate was unclear, mainly because very few prospective long-term studies of MOH patients using the revised ICHD-II criteria have been performed.
Nevertheless, the role of each specific MEF2 member, such as MEF2A or MEF2C, in cardiac hypertrophy remains unclear mainly because of the lethal cardiac phenotypes resulting from genetic deletions of these members[15], [16], [17].
The effect of chemotherapy on survival is unclear, mainly owing to a lack of randomised trials.
118 (3 %) times SSF's were not classifiable, mainly due to unclear phrasing of the SSF.
In pediatric populations, the use of resting heart rate as a health index remains unclear, mainly in epidemiological settings.
The clinical role of proteinuria is still unclear, mainly due to a lack of data on its pathogenesis.
However, the nature of the relationship between these asymmetries is still unclear, mainly because handedness can embrace multiple dimensions.
