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## Index Hopping Mitigation
Index hopping can impact pooled samples sequenced on Illumina sequencing platforms that utilize patterned flow cells and exclusion amplification chemistry. To minimize index hopping, follow the guidelines listed below.
- l Remove adaptors during cleanup steps.
- l Ensure no leftover primers and/or adaptors are present when performing Post-Library Construction QC.
- l Store each library individually at 4°C for up to 72 h or at -20°C for longterm storage. DO NOT pool libraries during storage.
- l Pool libraries prior to sequencing. An additional 1.0X SPRI may be performed for the pooled libraries to remove any free adaptors before sequencing.
- l Hopped indices can be computationally removed from the data generated from single cell dual index libraries.
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## Step 1:
## GEM Generation and Barcoding
| 1.0 Get Started | 30 |
|------------------------------------------|------|
| 1.1 Prepare Master Mix | 31 |
| Assemble GEM-X Chip | 32 |
| 1.2 Load GEM-X Chip | 36 |
| 1.3 Run the Chromium X Series Instrument | 38 |
| 1.4 Transfer GEMs | 39 |
1
1.5 GEM-RT Incubation
40
## 1.0 Get Started
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Firmware Version v2.0.0 or higher is required for Chromium X/iX and v2.2.0 or higher is required for Chromium Xo instrument.
| Item | 10x PN | Preparation & Handling ...
|---------------------------------|------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------...
| Equilibrate to Room Temperature | Equilibrate to Room Temperature | ...
| □ | GEM-X Single Cell 3' Gel Bead v4 2001128 | Equilibrate to room temperature 30 min before loading the chip. ...
| □ | RT Reagent E 2001106 | Vortex, verify no precipitate, centrifuge briefly. If a precipitate is observed, warm the tube with hands until the precipitate dissolves. Vortex and centrifuge ...
| □ | Template Switch Oligo B 2001027 | Centrifuge briefly, resuspend in 65 μ l Low TE Buffer. Vortex 15 sec at maximum speed, centrifuge briefly. Resuspended solution can be used immediately. After resuspension, store at -80°C . Thaw at room temperature for ≥ 30 minutes in ...
| □ | Reducing Agent B 2000087 | Vortex, verify no precipitate, centrifuge briefly. ...
| Place on Ice | Place on Ice | ...
| □ | Cell Suspension - | ...
| □ | RT Enzyme E 2001105/ 2001146 | Centrifuge briefly before adding to the mix. ...
| □ | 1X PBS - | ...
| Obtain | Obtain | ...
| □ | Partitioning Oil B 2001213 | - ...
| □ | GEM-X 3' Chip Verify name and PN 2001097 | See Tips & Best Practices. ...
| □ | X/iX Chip Gasket 3000656 | See Tips & Best Practices. ...
| □ | Chromium X/iX or Chromium X Series Chip Holder | 3000598 See Tips & Best Practices. ...
| □ | 10x Vortex Adapter 330002 | See Tips & Best Practices. ...
| □ | 50% glycerol solution If using < 8 reactions - | See Tips & Best Practices. ...
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## 1.1 Prepare Master Mix
- a. Prepare Master Mix on ice. Pipette mix 15x and centrifuge briefly.
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