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Some of these peptide types and modifications include: Lactam Cyclizations Thioether Cyclizations FRET Substrates TR-FRET Substrates Isotope-labeled Peptides Peptide Stapling Peptide Macrocycles Click Peptides Dye and Fluorescent Labels PEGylation (mono- and polydispersed) Metal Chelating Conjugates Multiple Disulfide Bonds Glycosylation Phosphorylation Sulfation and Sulfonation Incorporation of Unnatural Amino Acids Lipidation N-Terminal Modifications C-Terminal Modifications Hydrophobic Sequences Peptoids Rhodamine 110 Labeled Cell-Penetrating Peptides Long Sequences Long Sequences Native Chemical Ligation Epitope Mapping Peptide Libraries Neoantigen-based Libraries Protein Conjugation Selenocysteine Depsipeptides Peptidomimetics Multiple Antigenic Peptides (MAPs) Maleimide Group Installation Peptide-Oligonucleotide Conjugate (POC) Lactam Cyclizations Thioether Cyclizations FRET Substrates TR-FRET Substrates Isotope-labeled Peptides Peptide Stapling Peptide Macrocycles Click Peptides Dye and Fluorescent Labels PEGylation (mono- and polydispersed) Metal Chelating Conjugates Multiple Disulfide Bonds Glycosylation Phosphorylation Sulfation and Sulfonation Incorporation of Unnatural Amino Acids Lipidation N-Terminal Modifications C-Terminal Modifications Hydrophobic Sequences Peptoids Rhodamine 110 Labeled Cell-Penetrating Peptides Long Sequences Native Chemical Ligation Epitope Mapping Peptide Libraries Neoantigen-based Libraries Protein Conjugation Selenocysteine Depsipeptides Peptidomimetics Multiple Antigenic Peptides (MAPs) Maleimide Group Installation Please note: CPC Scientific cannot supply personal care or compounding requests

Cells were then quenched with 2 M SNAP-Cell Block (New England Biolabs) for 30 min, washed twice with culture medium, incubated for 30 min, and washed once more
3.1.1.2 ATF4 and ATF3 CHAC1, an enzyme that degrades intracellular glutathione, is a direct target of the transcription factor ATF4, activated by UPR signals via the PERK-EIF2A pathway