Abstract: In some embodiments, the disclosure relates generally to methods, as well as related, systems, compositions, kits and apparatuses, for nucleic acid analysis that involve the use of modified nucleotides, including terminator nucleotides and/or tagged nucleotides, in a template-dependent nucleotide incorporation reaction. In some embodiments, the nucleic acid analysis can be conducted at a single reaction site, or at a plurality of reaction sites in an array of reaction sites. Optionally, the array contains a plurality of reaction sites having about 1-100 million, or about 100-250 million, or about 200-500 million, or about 500-900 million, or more reaction sites. Optionally, each reaction site is in contact with, operatively coupled, or capacitively coupled to one or more sensors that are ion-sensitive FETs (isFETs) or chemically-sensitive FETs (chemFETs) sensors. Optionally, the reaction sites are in fluid communication with each other.

Abstract: In some embodiments, the disclosure relates generally to methods, as well as related, systems, compositions, kits and apparatuses, for nucleic acid analysis that involve the use of modified nucleotides, including terminator nucleotides and/or tagged nucleotides, in a template-dependent nucleotide incorporation reaction. In some embodiments, the nucleic acid analysis can be conducted at a single reaction site, or at a plurality of reaction sites in an array of reaction sites. Optionally, the array contains a plurality of reaction sites having about 1-100 million, or about 100-250 million, or about 200-500 million, or about 500-900 million, or more reaction sites. Optionally, each reaction site is in contact with, operatively coupled, or capacitively coupled to one or more sensors that are ion-sensitive FETs (isFETs) or chemically-sensitive FETs (chemFETs) sensors. Optionally, the reaction sites are in fluid communication with each other.