(redirected from Postnatal Day 4)
P4Pentium IV (Intel microprocessor)
P4Persona 4 (game)
P4Primary 4 (various schools)
P4Progesterone (hormone)
P4Perforce (software vendor)
P4Perfect Fourth (music)
P4Postnatal Day 4
P4Personal For (US Navy)
P4Prevent Polythene - Protect Planet (India; eco-campaign)
P4Product, Price, Promotion and Place (marketing analysis tool)
P4Photolithographic Pattern Plated Probe
References in periodicals archive ?
Frequently, litter size is reduced on postnatal day 4 (usually to four males and four females), and litter size is further reduced at weaning (postnatal day 21), so that only one animal/sex/litter is held until adulthood.