Because energy is strictly conserved and is also locally conserved (wherever it can be defined), it is important to remember that by definition of energy the transfer of energy between the "system" and adjacent regions is work.

The reason for this is that relativistic equations show that even "massless" particles such as photons still add mass and energy to isolated systems, allowing mass (though not matter) to be strictly conserved in all processes where energy does not escape the system.

The first zinc cluster is strictly conserved, whereas the second zinc cluster displays variability in the position of the two His residues.

The reaction catalyzed by RNR is strictly conserved in all living organisms.

Amino acid alignments show that the endonuclease-like catalytic motifs of the yCCR4 C-terminal domain are strictly conserved among all yCCR4-related proteins and identify CCR4-specific residues in this domain.

In addition, the putative active residues shared by both AP endonucleases and DNAseI [ 29 30 31 32 ] , are strictly conserved in all the yCCR4-related proteins: these are residues involved in catalysis (indicated by triangles in Fig.

All these sites are strictly conserved in the ASFV subunits (Figs. 3 and 4).

The location of the introns in all three genes coding for the three subunits is strictly conserved.

So of the common physical variables: 'energy', with the associated continuous symmetry 'time'; 'momentum' with the associated continuous symmetry 'position'; and 'angular momentum' with the associated continuous symmetry 'rotation' are strictly conserved.

Sixteen cysteine residues, forming 8 disulfide bonds, are strictly conserved in CRISPs.