Xu et al reported the overall methylation differences between different tissues and strains of chicken [30], which provided the first attempt to elucidate the DNA methylation variations between chicken breeds with heterogeneous genetic background.
PcG gene expression is tightly regulated and differs between different tissues and cell types.
Currently, TM4SF members have increased to 25, although their amino acid sequence share a high homology, there are significant differences between different tissues and cells, particularly the recently reported TM4SF molecules, such as CD9, CD63, CD82, CO-029, PETA-3/SFA-1, SAS, etc., which have been identified as tumor-associated proteins[ 14, 18, 25, 27].
Tissue-based maps of human proteomes have identified differences in druggable proteins, cancer proteins, and their metabolism between different tissues and organs.
Previous studies indicated that X-rays are absorbed to varying degrees by different parts of the seed and helps to distinguish between different tissues and injuries, although physiological changes are not visible (Simak 1957; Kriebel 1972).
The readers assessed the image quality subjectively based on prevalence of noise, contrast between different tissues and organs (e.g. differentiation between the lung and thoracic wall) and lesion detectability.
We have also seen how these might differ between different tissue and, particularly, between winter and spring varieties of wheat.
This added layer of information allows some comparison of peroxisomal abundance between different tissue and cell types of the body to be made.
All the same, these studies alert us to the possibility that receptor expression differs between different tissues, ages of tissue and possibly even species.
In studies of tissue specific DNA methylation regions, high CpG content regions such as the CpG islands showed less between individual variance and less differences between different tissues [ 28- 30], and this may be the same case between different species.
Some experiments indicate that the balance between the different isoforms is important, whereas others have shown that the balance between the isoforms changes during the cell cycle and differs between different tissues.
