The alpha-3 beta-4 nicotinic receptor, also known as the α₃β₄ receptor, is a type of nicotinic acetylcholine receptor, consisting of α₃ and β₄ subunits. It is located in the autonomic ganglia and adrenal medulla, where activation yields post- and/or presynaptic excitation.

As with other nicotinic acetylcholine receptors, the α₃β₄ receptor is pentameric [(α₃)_m(β₄)_n where m + n = 5]. The exact subunit stoichiometry is not known and it is possible that more than one functional α₃β₄ receptor assembles in vivo with varying subunit stoichiometries.

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EP, Ep, The EP or may refer to:

In arts and entertainment

Music

Other uses in arts and entertainment

The $5.98 E.P.: Garage Days Re-Revisited is an extended play by American heavy metal band Metallica. It was released on August 21, 1987 by Elektra Records.

Recording

The $5.98 E.P. Garage Days Re-Revisited was the group's first recording to feature its new bassist Jason Newsted (credited as "Master J. Newkid" in the liner notes). It is also the band's first release following the death of second bassist Cliff Burton. The extended play consisted entirely of covers of late-'70s and early-'80s New Wave of British Heavy Metal bands and hardcore punk music rehearsed in Lars Ulrich's soundproofed garage and then recorded in Los Angeles over the course of six days. The group included the dollar price in the title (which was printed on the cover) in an effort to ensure that fans were not overcharged for it, some retailers did ultimately charge more than the $5.98 price referenced in the title. The original cassette release included a sticker which read "If they try to charge more, STEAL IT!" The official United States CD release of the EP amended the title (and the price) to The $9.98 CD because the retail price of CDs was much higher than cassettes; other countries (such as Australia) still displayed The $5.98 E.P. with a sticker stating that this was the "title" and not the price. "The Wait" was omitted from the UK pressings in order to conform to local music-industry rules regarding the length of EPs.

The abbreviation E&P may stand for: