The baseScribe Mod Cap1 Kits enable the efficient production of Cap1‑capped, pseudouridine‑ or N1-methylpseudouridine‑modified mRNA by in vitro transcription (IVT) from DNA templates containing a T7 RNA polymerase promoter. The kits are designed for researchers who require translationally competent, immunosilent mRNA, generated in a single co‑transcriptional reaction.