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Description
This only means that a solution may appear clear, yet chemical changes have already occurred

PMID: 37364590 | doi:10.1016/S0140-6736(23)01163-7 Yao H et al

For instance, if you receive these injections but carry on like normal e.g

Hutchinson AJ, Chou CL, Israel DD, Xu W, Regan JW (2009) Activation of EP2 prostanoid receptors in human glial cell lines stimulates the secretion of BDNF
I'm going, whoa

Diverse functions of matrix metalloproteinases during fibrosis