Several studies have evidenced low levels of melatonin in blood of patients with migraine, chronic migraine and cluster headache chronic [40, 41].
Assays of the substrate specificity of the murine DNA methyltransferases in transgenic Drosophila, evidenced low levels of non-CpG methylation in flies expressing either Dnmt3a or Dnmt2 [15].
Evidences show low levels of participation in such programs.
In the initial stages of growth there is evidence for low levels of an intermediate.
Petitto, J. M., Huang, Z. & McCarthy, D. B. Molecular cloning of NPY-Y1 receptor cDNA from rat splenic lymphocytes: evidence of low levels of mRNA expression and 125I-NPY binding sites.
For instance, there is compelling evidence that low levels of vitamin D3 are a risk factor for multiple sclerosis (MS), a disease in which the immune system attacks the central nervous system and causes demyelination and axon degeneration.
Professor Helga Refsum, from the University of Oslo, another B-vitamin researcher, said that the study was "further evidence" that low levels of B12 were linked to Alzheimer's.
There is no evidence that low levels of radiation hurt people, but rather than be blunt about that, scientists have, in the past, shaded the truth often out of a misguided sense of erring on the side of caution, but thereby allowing widespread misunderstanding of radiation to persist.
There is also evidence of low levels of intraspecific brood parasitism, with females laying eggs in the nests of other cattle egrets.
However, there is evidence of low levels of allelic polymorphism or heterozygosity [ 7], as already documented in Passiflora alata, the sweet passion fruit [ 53].
