That's because when the first, slowly reproducing molecule copies itself, the original molecule and the copy have time to drift apart before either reproduces again, preventing crowding.
Many small gaps remain, and these complicate still further the job of identifying genes by looking directly at the sequence of base pairs.One way round this is to intercept the messenger molecules that the copying machinery puts out, and decode them.
Human built systems will be, at best, like Swampmen (beings that result from a lightning strike in a swamp and by chance happen to be a molecule by molecule copy of some human being, say, you)—they appear to have intentionality or mental states, but do not, because such states require the right history.
This idea evolved into his lab's current study of the spatial arrangement of molecules during transcription (the copying of one strand of DNA into a complementary RNA sequence by the RNA polymerase enzyme) and how molecular motors generate force in real time.
Especially when the copy number of molecules like mRNA or protein gets smaller, stochastic fluctuations can have significant effect on the behavior of a cell.
The manufacturing process requires microorganisms, purification, and sometimes modification of the molecule, which complicates the copying process.
The fact that both alleles exhibit identical lesions in some animals suggests that a chromosome previously cut by Cas9 and repaired by non-homologous end joining (NHEJ) was used as a donor molecule to copy the lesion into the homolog.
The copy number of mtDNA molecules in primordial germ cells falls to very low levels [31 33].
In order to estimate the copy numbers of vector molecules present in liver tissues a quantitative PCR (qPCR) was performed.
These simulations enable to follow the copy number of each molecule in a single cell as a function of time.
