title: GSM2374203: HE8W_CTB2_sc75; Homo sapiens; RNA-Seq
library_construction_protocol: Chrion were scraped from human  placenta and the remaining villi were collected and minced into small pieces. The tissue were digested with an enzyme cocktail (0.125% trypsin 0.04% Dnase and 0.05% type Ⅳcollagenase) for 8 min twice at 37 ℃. Cell suspension were collected by filtering the ezyme mixture with 70 μm cell strainer and the enzyme reaction were stopped by addition of 5% DMEM. cells were centrifuged at 1200 g at 4 ℃ on a percoll gradient (7 layers: 10%, 20%, 30%, 40%, 50%, 60% and 70%) and cells from 30% - 50% percoll gradient were collected and washed with DMEM. EVT and CTB were sorted with MACS with PE-conjucted HLA-G and CDH1 antibody combined with anti-PE beads,STB were purified with mouth pipette based on their big size from the cell population and the remaning HLA-G and CDH1 double negative cells were stromal cells. For isolation of EVT from the basal plate of the 24 w placenta, basal plate were scaped from the placenta, minced and  digested with the method as described above,finally 24 w EVT were purified by MACs with HLA-G antibody. the single cells were picked into 2ul cell lysis buffer using mouse pipet, then the transcriptome was amplified by modified smart-seq2 protocol which added in barcode for each cell. the amplified cDNAs were sheared into 300bp  fragments, the 3' end of the cDNAs were enriched to build library with KAPA Hyper Prep Kits for Illumina
attributes.tag: GEO Accession
attributes.value: GSM2374203