mTOR serves as a master regulator of autophagy49 and exists as two complexes, mTORC1 and mTORC2.
Nitrogen exists as two stable isotopes, 14N (abundance 99.63 percent) and 15N (abundance 0.37 percent).
Normally, DNA exists as two intertwined strands of the chemical letters A, G, C and T-the familiar double helix.
When the uracil is 6-amino-1,3-dimethyluracil, the product exists as two tautomers at room temperature.
Caspase-2 exists as two main isoforms: the caspase-2L long isoform, which is pro-apoptotic, and the caspase-2S short isoform, which may be anti-apoptotic.
The C4 protein exists as two isotypes C4A and C4B encoded by the C4A and C4B genes, both of which are found with varying copy numbers.
The mouse TNF-α Thr-Leu cleavage sequence and a potential transmembrane domain were also found, suggesting that sbTNF-α exists as two forms: a ∼28 kDa membrane-bound form and a ∼18.4 kDa soluble protein.
IscU exists as two slowly interconverting species: one (S) is largely structured with all four peptidyl prolyl bonds trans; the other (D) is partly disordered but contains an ordered domain that stabilizes two cis peptidyl prolyl peptide bonds.
The Gododdin exists as two texts, A and B, with the latter believed to have been written down in about the 10th century.
Further scrutiny of the central density revealed that it exists as two parts (Fig. S5B and S5C).
It is a planar, highly symmetric molecule (D 3h point group) and exists as two tautomers: the trithiol form (I) and the trithione form (II), as illustrated in Eq. (1) [7, 8, 9]: Open image in new window (1).
