In addition to histone modification, l-lactylation has also been identified in nonhistone proteins
After being blocked in the buffer (containing 0.5% Triton X-100, 5% donkey serum in PBS) for 1 hr at room temperature, they were incubated in primary antibodies, including anti-glutamate (1:500, rabbit, Sigma), anti-GABA (1:500, rabbit, Sigma), anti-ChAT (1:500, goat, Millipore),anti-mu opioid receptor (1:500, rabbit, Abcam), and anti-TUBB3 (1:500, rabbit, Abcam) at 4 C for 24 hr
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This is why oral ipamorelin products that claim "enhanced absorption" or "enteric protection" still fail in functional assays: even if 5% of the dose survives gastric transit intact, the remaining molecule must navigate intestinal peptidases, first-pass hepatic metabolism, and systemic peptidases before reaching the pituitary