Variety shows, also known as variety arts or variety entertainment, is entertainment made up of a variety of acts including musical performances, sketch comedy, magic, acrobatics, juggling, and ventriloquism.
 It is normally introduced by a compère (master of ceremonies) or host.
 The variety format made its way from Victorian era stage to radio and then television.
 Variety shows were a staple of anglophone television from the late 1940s into the 1980s.
The mammalian 5-HT receptor is a subtype of the 5-HT receptor that belongs to the serotonin receptor family and is a G protein-coupled receptor (GPCR).
 5-HT is short for 5-hydroxy-tryptamine, which is serotonin.
 This is the main excitatory receptor subtype among the GPCRs for serotonin, although 5-HT may also have an inhibitory effect on certain areas such as the visual cortex and the orbitofrontal cortex .
 This receptor was first noted for its importance as a target of serotonergic psychedelic drugs such as LSD.
 Later it came back to prominence because it was also found to be mediating, at least partly, the action of many antipsychotic drugs, especially the atypical ones.
The Four Nineteen Building is a historic gas station building located at 419 E. 83rd St. in the Chatham community area of Chicago, Illinois.
 The station was built in 1928 by William D. Meyering and David L. Sutton, two local real estate businessmen.
 The station is an example of the Domestic style of gas station architecture, in which stations were designed to resemble small houses.
 A wooden canopy supported by brick piers covers the building's front entrance and two garage bays extend from either side, making the station part of a subtype of the Domestic style appropriately named "House with Canopy and Bays".
 The station's walls are built with clinker bricks laid in a skintled pattern, a combination of two Chicago construction innovations.
 Clinker bricks were heated at higher temperatures than standard bricks, making them swollen, dense, and differently colored; the bricks were generally discarded until the 1920s, when Chicago architects began to build with them.
 The skintled pattern of brickwork consisted of rough and irregular bricklaying in which bricks stuck out of and into the wall at different angles.
 The building's parapet roof is tiled with multicolored Mission style clay tiles, which were thought to pair well with skintled walls by architects of the era.
 Gas stations constructed from the 1930s onward generally had more functional designs, and as of 1999, the Four Nineteen Building was one of only sixteen Domestic-style gas stations remaining in Chicago and one of three with both a canopy and bays.
Dopamine receptor D, also known as D1BR, is a protein that in humans is encoded by the "DRD5" gene.
 It belongs to the D1-like receptor family along with the D receptor subtype.
Hullabaloo is an American musical variety series that ran on NBC from January 12, 1965 through April 11, 1966 (with repeats to August 1966).
 Similar to "Shindig!
" it ran in prime time in contrast to ABC's "American Bandstand."
Intraocular lymphoma is a rare malignant form of eye cancer.
 Intraocular lymphoma may affect the eye secondarily from a metastasis from a non-ocular tumor or may arise within the eye primarily (primary intraocular lymphoma, PIOL).
 PIOL is a subset of primary central nervous system lymphoma (PCNSL).
 PCNSL (and PIOL) are most commonly a diffuse large B-cell immunohistologic subtype of non-Hodgkin's lymphoma according to the World Health Organization (WHO) classification of lymphomas.
 The most common symptoms of PIOL include blurred or decreased vision due to tumor cells in the vitreous.
 Most cases of PIOL eventuate to central nervous system involvement (PCNSL) while only 20% of PCNSL lead to intraocular (PIOL) involvement.
 PIOL and PCNSL remain enigmas because both structures are immunologically privileged sites (the brain sits behind the blood–brain barrier and the retina sits behind the blood-retinal barrier) and so do not normally have immune cells trafficking through these structures.
 What is more, while the vast majority of PCNSL in patients with acquired immune deficiency syndrome (AIDS) is related to the Epstein-Barr virus (EBV), the development of PCNSL and PIOL in immunocompetent patients is unknown and shows no general relation to infectious DNAs.
The sirwal, saroual, seroual, sarouel or serouel (Persian: شلوار‎ ‎ "šalvār"; Arabic: سروال‎ ‎ "sirwāl"; Turkish: "şalvar" , Kazakh: шалбар (şalbar), Bengali: সালোয়ার , "shalwar " , Urdu: شلوار‎ , "shalwar " ), also known as "punjabi pants" and in some contexts as (a subtype of) Harem pants, are a form of baggy trousers predating the Christian era.
 They are typically worn in Muslim countries, but also extensively in the Greek countryside (and other places in the Balkans that were influenced by Ottoman Turks) prior to World War II.
 The trousers are not originally an Arab garment but were introduced from Persia to Muslim countries.
 The sirwal is also worn by other communities in North India.
Hullabaloo (or "Hulla") was a rave promotions company based in Toronto, Ontario, Canada.
 Hullabaloo was started in 1997 by DJ Anabolic Frolic as a way to promote Happy Hardcore music and the kind of event that got back to the roots of what a rave was.
Macitentan (trade name Opsumit) is an endothelin receptor antagonist (ERA) approved for the treatment of pulmonary arterial hypertension (PAH).
 The other two ERAs marketed as of 2014 are bosentan and ambrisentan.
 Macitentan is a dual ERA, meaning that it acts as an antagonist of two endothelin (ET) receptor subtypes, ET and ET.
 However, macitentan has a 50-fold increased selectivity for the ETA subtype compared to the ETB subtype.
 The drug received approval from the U.S. Food and Drug Administration (FDA) on October 13, 2013.
Glutamate receptor, ionotropic, delta 2, also known as GluD2, GluRδ2, or δ, is a protein that in humans is encoded by the "GRID2" gene.
 This protein together with GluD1 belongs to the delta receptor subtype of ionotropic glutamate receptors.
 They possess 14–24% sequence homology with AMPA, kainate, and NMDA subunits, but, despite their name, do not actually bind glutamate or various other glutamate agonists.

Question: Hullabaloo belongs to a subtype of shows with roots in what era?
Answer: Victorian era