different positions
different possibilities
different postnatal ages
different postures
different potency
different potentials
different practices
different precursors
different predictions
different predictors
different preferences
different preparations
different presentations
different pressures
different pretreatments

different prevalences
different prey
different primer pairs
different principles
different priorities
different problems
different procedures
different process parameters
different processes
different processing
different processing conditions
different processing parameters
different product
different products
different professional groups
different professionals

different professions
different profiles
different prognoses
different programs
different projects
different promoters
different properties
different proportions
different protein levels
different protein sources
different proteins
different protocols
different purposes
different quality
different quantities
different questions

different races
different racial
different racial groups
different ranges
different raters
different rates
different rationales
different ratios
different raw materials
different reaction conditions
different reaction mechanisms
different reaction parameters
different reaction pathways
different reaction temperatures
different reaction times
different reactions

different reactivities
different readings
different reagents
different reasons
different receptors
different regimens
different regimes
different regions
different relationship
different relationships
different relative humidities