In cytology, a precursor cell, also called a blast cell or simply blast, is a type of partially differentiated, usually unipotent cell that has lost most or all of the stem cell multipotency.

Usually precursor cells are cells capable of differentiating into one or two closely related final forms. Sometimes precursor cell is used as an alternative term for multipotent stem cells.

A blastoma is a type of cancer created by malignancies of precursor cells.

In embryology, precursor cells are group of cells that differentiate later into one organ.

Precursor cell – Britannica Online Encyclopedia

mc chris (born Christopher Brendan Ward IV on September 2, 1975, Libertyville, Illinois) is an American rapper, voice actor, writer, and improvisational comedian.

He attended the School of the Art Institute of Chicago, and New York University's (NYU) Tisch School of the Arts. He self releases with no current record label. mc chris originally performed with The Lee Majors (aka Dirt Bike Annie). Sometimes associated with the genre of nerdcore hip-hop, his trademarks include the synthesis of his "geek" heritage with the "gangster" image associated with hip hop artists, and the high pitch of his voice. He has released five albums, three EPs, one re-release, and a tenth anniversary edition of his recordings with The Lee Majors.

Since August 2010, he has created the theme songs for several of the SModcast Internet Radio (S.I.R.) programs, including those for the original SModcast, Blow Hard, Bagged & Boarded and Jay & Silent Bob Get Old.

Ward has appeared and worked behind the scenes and contributed original lyrics to many of Williams Street Studios' shows on Adult Swim, most notably Aqua Teen Hunger Force. He worked as a production assistant and starred as the character MC Pee Pants in the episodes "MC Pee Pants", "Sir Loin", "The Last One", and "Little Brittle, as well as the young Carl in episode 18. He reprised the role of MC Pee Pants in Aqua Teen Hunger Force Colon Movie Film for Theaters and in the PlayStation2 video game, Aqua Teen Hunger Force Zombie Ninja Pro-Am. He also had a role in Sealab 2021, as a writer and as the recurring character Hesh Hepplewhite, as well as the twins who play "Dolphin Boy", in a "behind-the-scenes" type episode.

Tokio Hotel is a rock band from Germany, founded in 2001 by singer Bill Kaulitz, guitarist Tom Kaulitz, drummer Gustav Schäfer and bassist Georg Listing. The quartet have scored four number one singles and have released three number one albums in their native country, selling nearly 5 million CDs and DVDs there. After recording an unreleased demo-CD under the name "Devilish" and having their contract with Sony BMG Germany terminated, the band released their first German-language album, Schrei, as Tokio Hotel on Universal Music Germany in 2005. Schrei sold more than half a million copies worldwide and spawned four top five singles in both Germany and Austria. In 2007, the band released their second German album Zimmer 483 and their first English album Scream which have combined album sales of over one million copies worldwide and helped win the band their first MTV Europe Music Award for Best InterAct. The former, Zimmer 483, spawned three top five singles in Germany while the latter, Scream, spawned two singles that reached the top twenty in new territories such as France, Portugal, Spain and Italy. In September 2008, they won in the US their first MTV Video Music Award (VMA) for Best New Artist. In October 2008, they won four awards including Best International Artist and Song of the year at Los Premios MTV Latinoamérica (MTV Video Music Awards Latin America) held in Mexico. Tokio Hotel became the first German band ever to win an award at the MTV VMAs and also at the MTV Latin America Awards. They also picked up the Headliner award at the MTV Europe Music Awards 2008 held in Liverpool on November 6, 2008 and the Award for Best Group on November 5, 2009 at the MTV Europe Music Award (EMA) held in Berlin. They won an Award for Best World Stage Performance on November 7, 2010 at the MTV Europe Music Awards in Madrid. In July 2011, they became the first German band to win an MTV Video Music Awards Japan (VMAJ). And won MTV's 2012 Musical March Madness.