Protocol to combine brain sections from multiple mice into a single block for spatial transcriptomic analyses

Spatial transcriptomics couples visual spatial markers with gene expression levels, but slide space and cost limit the number of samples that can be processed. Here, we present a protocol for mounting brains from multiple mice onto a single capture area of a spatial transcriptomics slide. We describe steps for conjoining frozen hippocampal sections from different brains into a single cryostat block, reducing the quantity of reagents required. This protocol is applicable to a range of existing spatial genomics platforms. For complete details on the use and execution of this protocol, please refer to Li et al. (2023).¹.