The 10x 3P v3 protocol was followed according to manufacturer’s instructions for cDNA amplification, with the following modifications:

During cDNA amplification, 0.2 μM of ADT additive primer (5′CCTTGGCACCCGAGAATTCC) and 0.2 μM of HTO additive primer (5′GTGACTGGAGTTCAGACGTGTGCTC) were added to the reaction.

During cDNA cleanup, the supernatant from the 0.6x SPRI cleanup was saved and purified with two rounds of 2x SPRI. The eluate was split and used as template for production of ADT and Hashtag libraries:

Hashtag libraries were generated by PCR using Kapa Hifi Master Mix, 10 μM 10x Genomics SI-PCR primer (5′AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTC), and 10 μM Illumina TruSeq DNA D7xx primer (5′CAAGCAGAAGACGGCATACGAGATxxxxxxxxGTGACTGGAGTTCAGACGTGTGC). Following amplification, Hashtag libraries were and cleaned up with 1.6x SPRI.

Antibody tag libraries were generated by PCR using Kapa Hifi Master Mix, 10 μM 10x Genomics SI-PCR primer, and 10 μM TruSeq Small RNA RPIx primer (5′CAAGCAGAAGACGGCATACGAGxxxxxxxxGTGACTGGAGTTCCTTGGCACCCGAGAATTCCA) Following amplification, Antibody tag libraries were and cleaned up with 1.6x SPRI.
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