For Each of the Following Sentences, Fill in the Blanks

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below.Not all words or phrases will be used; use each word or phrase only once.
$\begin{array}{lll}\text { combinatorial } &\quad\quad\quad\quad\quad\quad\quad\quad \text { feedback } & \text { phosphorylation } \\\text { deacetylation } & \quad\quad\quad\quad\quad\quad\quad\quad\text { histone } & \text { pluripotency } \\\text { differential } &\quad\quad\quad\quad\quad\quad\quad\quad \text { leucine zipper } & \text { proliferation } \\\text { epigenetic } &\quad\quad\quad\quad\quad\quad\quad\quad \text { memory } & \text { receptor } \\\text { expression } & \quad\quad\quad\quad\quad\quad\quad\quad\text { methylation } & \text { unwinding }\end{array}$ The transmission of information important for gene regulation from parent to daughter cell, without altering the actual nucleotide sequence, is called __________ inheritance.This type of inheritance is seen with the inheritance of the covalent modifications on __________ proteins bound to DNA; these modifications are important for reestablishing the pattern of chromatin structure found on the parent chromosome.Another way to inherit chromatin structure involves DNA __________, a covalent modification that occurs on cytosine bases that typically turns off the transcription of a gene.Gene transcription patterns can also be transmitted across generations through positive __________ loops that can involve a transcription regulator activating its own transcription in addition to other genes.These mechanisms all allow for cell __________, a property involving the maintenance of gene expression patterns important for cell identity.