Dynamic allostery in the peptide/MHC complex enables TCR neoantigen selectivity.

The inherent antigen cross-reactivity of the T cell receptor (TCR) is balanced by high specificity. Surprisingly, TCR specificity often manifests in ways not easily interpreted from static structures. Here we show that TCR discrimination between an HLA-A*03:01 (HLA-A3)-restricted public neoantigen and its wild-type (WT) counterpart emerges from distinct motions within the HLA-A3 peptide binding groove that vary with the identity of the peptide's first primary anchor.

Application of predictive modeling tools for the identification of Ocimum spp. herbal products.

Species identification of botanical products is a crucial aspect of research and regulatory compliance; however, botanical classification can be difficult, especially for morphologically similar species with overlapping genetic and metabolomic markers, like those in the genus Ocimum. Untargeted LC-MS metabolomics coupled with multivariate predictive modeling provides a potential avenue for improving herbal identity investigations, but the current dearth of reference materials for many botanicals limits the applicability of these approaches. This study investigated the potential of using greenhouse-grown authentic Ocimum to build predictive models for classifying commercially available Ocimum products.

The Evolving T Cell Receptor Recognition Code: The Rules Are More Like Guidelines.

αβ T cell receptor (TCR) recognition of peptide-MHC complexes lies at the core of adaptive immunity, balancing specificity and cross-reactivity to facilitate effective antigen discrimination. Early structural studies established basic frameworks helpful for understanding and contextualizing TCR recognition and features such as peptide specificity and MHC restriction. However, the growing TCR structural database and studies launched from structural work continue to reveal exceptions to common assumptions and simplifications derived from earlier work.

Authentication and Quality Control of the Brazilian Traditional Herb 'Carquejas' ( Species) Using Morpho-Anatomy and Microscopy.

This research investigates the morpho-anatomical characteristics of seven species, namely , , , , , and . Commonly called carquejas, these species have aerial photosynthetic winged stems known as cladodes and are widely used traditionally to treat digestive and diuretic disorders. This study aimed to characterize these commonly misidentified species using morphological and microscopic techniques, including light and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy.

Development of a Specific PCR Assay for sp. Yokoyama and Assessment of Its Potential to Cause Anemia in Cattle.

The clinical implications of sp. Yokoyama, a recently identified species in cattle, remain uncertain. The objective of the present study was to evaluate the anemia status in cattle infected with sp.