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Example sentences for: rare

How can you use “rare” in a sentence? Here are some example sentences to help you improve your vocabulary:

These include the overall gene organization of the trp operon, for which many microbial patterns are known; the extremely rare gene order of trpEa trpEb instead of the typical order trpEb trpEa; the fusion of genes encoding the alpha ( trpAa ) and beta ( trpAb ) subunits of anthranilate synthase, a fusion that exists in only a limited number of other taxa, and the presence of operonic genes exhibiting distinctive homology subtypes ( aroA Iβ and tyrA (p) ).
Findings include: There is not one plant kingdom but three; a rare tropical flower is the closest living relative of the Earth's first flowering plant; and many plant families appear to have evolved from a single "Eve," whose close relatives survive in some of today's more pristine lakes.
Rare SPAM1 transcripts are however not ubiquitous as revealed by their absence from human ovary, spleen, and liver [ 21 ] and murine skeletal muscle [ 22 ] . Both rare and abundant SPAM1 transcripts have been found in neoplastic breast tissue [ 23 ] and in a number of other cancers including pharyngeal [ 24 ] , metastatic melanomas and gliomas [ 25 ] . In normal somatic cells rare transcripts have been found in breast tissue [ 23 ] and in fetal, placental, and prostate cDNA libraries [ 21 ] .
(You and I, of course, are the rare exception.)
In the life stories the teen-agers so eagerly share, it's hardly rare for fathers--or even mothers--to run away.