title: GSM9327730: G_Pos | 033 | DNA+; Homo sapiens; OTHER
library_construction_protocol: Samples were incubated with DNA-oligo barcoded RNA-ISH probes which were conjugated with a UV-photocleavable linker following standard ISH protocols, along with fluorescently labeled antibodies for visualization of morphological structures. Regions of interest within the tissue were illuminated with UV light and oligo barcodes were physically aspirated from the tissue and collected into microtiter plates by the GeoMx® Digital Spatial Profiler (DSP) platform. For more information about DSP protocols please see Merritt et al. Nature Biotech 2020 (doi: 10.1038/s41598-020-63539-x) Each collection of oligo tags from one well (representing an AOI from the tissue section) was indexed with i7xi5 unique dual indexes using GeoMx SeqCode primers with 18 cycles of PCR.  After PCR, indexed AOIs were pooled and purified in two rounds of AMPure XP PCR purification using 1.2x bead:sample ratio.