The phrase "abundance levels" refers to the quantity or amount of something that is present in a plentiful or excessive way. It suggests that there is a large supply or plenty of something. Full definition
Li et al.'s analysis provides an accurate framework for quantifying gene expression and protein abundance levels by explicitly considering sources of error. (sciencedaily.com)
To model and predict the behavior of biological systems researchers must address the temporal changes in biomolecule (RNA and protein) abundance levels as well as their spatial distribution. (pnnl.gov)
Genes that are spatially proximal in sequence or 3D structure of the human genome are often co ‐ regulated at the mRNA abundance level. (msb.embopress.org)