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precipitation rates precipitation reaction precipitation records precipitation regimes precipitation series precipitation step precipitation time series precipitation totals precipitation variability precipitation variations precise precise action precise analysis precise assessment precise cause precise characterization precise classification precise contribution precise control precise dating precise definition precise description precise determination precise diagnosis precise effects precise estimates precise etiology	precise evaluation precise excision precise function precise identification precise identity precise information precise knowledge precise localization precise location precise manner precise measurement precise measures precise mechanism precise mechanisms underlying precise method precise molecular mechanism precise nature precise pattern precise placement precise positioning precise prediction precise quantification precise regulation precise relationship precise results precise role precise site precise spatial	precise structure precise understanding precise values precise way precision precision agriculture precision cosmology precision error precision grip precision measurements precision values preclinical preclinical data preclinical development preclinical evaluation preclinical evidence preclinical investigations preclinical medical students preclinical model preclinical models preclinical pharmacokinetics preclinical phase preclinical rationale preclinical research preclinical species preclinical stage preclinical studies preclinical testing	preclinical work precocene II precocious puberty precolumn derivatization preconcentration preconcentration step preconcentration technique preconcentration time preconditioned matrix preconditioner preconditioning preconditioning strategies preconditioning technique preconditioning techniques preconditions precontemplation stage precordial leads precore mutations precursor cell line precursor cell proliferation precursor cells precursor cells isolated precursor chains precursor complexes precursor compound precursor concentration precursor feeding precursor fibers	precursor films precursor form precursor frequencies precursor ion scanning precursor ions precursor lesions precursor material precursor molecules precursor peptide precursor polymer precursor pool precursor protein precursor route precursor solution precursor structures precursor synthesis precursor used precursors predation predation avoidance predation effects predation events predation pressure