Title: Krypton-85
Content:  Krypton-85 (85Kr) is a radioisotope of krypton. Krypton-85 has a half-life of 10.756 years and a maximum decay energy of 687 keV. It decays into stable rubidium-85. Its most common decay (99.57%) is by beta particle emission with maximum energy of 687 keV and an average energy of 251 keV. The second most common decay (0.43%) is by beta particle emission (maximum energy of 173 keV) followed by gamma ray emission (energy of 514 keV). Other decay modes have very small probabilities and emit less energetic gamma rays. Krypton-85 is mostly synthetic, though it is produced naturally in trace quantities by cosmic ray spallation. In terms of radiotoxicity, 440 Bq of 85Kr is equivalent to 1 Bq of radon-222, without considering the rest of the radon decay chain.
Title: CEP85L
Content:  CEP85L, for "Centrosomal Protein 85kDa-Like" is a gene which encodes a protein that has been identified as a breast cancer antigen. Nothing more is known of its function at this time. Three transcript variants encoding different isoforms have been found for this gene. It has been shown to be related to the QT interval in GWAS studies.
Title: GPR85
Content:  Probable G-protein coupled receptor 85 is a protein that in humans is encoded by the GPR85 gene.
Title: KRT85
Content:  Keratin, type II cuticular Hb5 is a protein that in humans is encoded by the KRT85 gene. The protein encoded by this gene is a member of the keratin gene family. As a type II hair keratin, it is a basic protein which heterodimerizes with type I keratins to form hair and nails. The type II hair keratins are clustered in a region of chromosome 12q13 and are grouped into two distinct subfamilies based on structure similarity. One subfamily, consisting of KRTHB1, KRTHB3, and KRTHB6, is highly related. The other less-related subfamily includes KRTHB2, KRTHB4, and KRTHB5.
Title: TK85
Content:   The TK85 was a ZX81 clone made by Microdigital Eletronica, a computer company located in Brazil. It came with 16 or 48 KB RAM, and had a ZX Spectrum–style case, similar to a Timex Sinclair 1500. Unlike the ZX81, the TK85 used discrete logic circuits instead of a ULA, and during manufacture, several chips were scraped so that competitors couldn't copy the circuit. The circuit board had space for a AY-3-8912 sound generator chip (compatible with the ZonX-81 sound board), and although none came factory installed, it is possible to add the necessary circuits. The TK85 came with a copy of the 8K ZX81 floating point BASIC, and an additional 2K EPROM, mapped to addresses 8192-10240, containing machine code routines for use with tape files. These routines could save (HISAVE), load (HILOAD) and verify (HIVERIFY) in "Hi-Speed" (4200 bps); save and load, BASIC variables in 300 bps (standard 
Title: KC 85
Content:  The KC 85 ('KC' meaning "Kleincomputer", or "small computer") were models of microcomputers built in East Germany, first in 1984 by VEB Robotron (the KC 85/1) and later by VEB Mikroelektronik "Wilhelm Pieck" Mühlhausen (KC 85/2, KC 85/3 and KC 85/4). Due to huge demand by industrial, educational as well as military institutions, KC 85 systems were virtually unavailable for sale to private customers.
Title: KC 85
Content:  They were based on the U880 CPU (an East German clone of the Z80), with clock speeds of 1.75 and 2 MHz. There were two main lines in the KC 85 series, the KC 85/2 (project name HC 900) to /4 and the KC 85/1 (project name Z 9001) by Robotron, which was a different system (only the CPU and the name were the same, but later the format of saving the programs on tape cassettes and the BASIC were also made compatible). In 1989, VEB Mikroelektronik Mühlhausen came up with the KC compact, but due to the GDR collapse very few units were actually 
Title: 85 (number)
Content: the product of two prime numbers (5 and 17), and is therefore a semiprime; specifically, the 24th biprime not counting perfect squares. Together with 86 and 87, it forms the second cluster of three consecutive biprimes. ; an octahedral number. ; a centered triangular number. ; a centered square number. ; a decagonal number. ; the smallest number that can be expressed as a sum of two squares, with all squares greater than 1, in two ways, 85 = 92 + 22 = 72 + 62. ; the length of the hypotenuse of four Pythagorean triangles. ; a Smith number in decimal. 85 is: 
Title: Keratin 5
Content:  Keratin 5, also known as KRT5, K5, or CK5, is a protein that is encoded in humans by the KRT5 gene. It dimerizes with keratin 14 and forms the intermediate filaments (IF) that make up the cytoskeleton of basal epithelial cells. This protein is involved in several diseases including epidermolysis bullosa simplex and breast and lung cancers.
Title: CCDC85B
Content:  Coiled-coil domain-containing protein 85B is a protein that in humans is encoded by the CCDC85B gene.

Question: krypton-85 decays by emission of a beta particle. the product of this decay is?
Answer: rubidium-85.