Articles, a selection:      Oh Jong-hyuk  Oh Jong-hyuk (; born February 16, 1983) is a South Korean singer and member of South Korean boy band Click-B.  Oh was educated at Dankook University High School, and graduated from Kyonggi University. Oh began his mandatory military service in 2011. He served as an active duty officer after his six weeks of basic military training at the Pohang Marine Corps Training Center. He was discharged in 2013. In September 2013, it was revealed that Oh had been dating T-ara member Soyeon for the past three years. After six years of dating, the relationship came to an end in 2016. In 1999, Oh debuted as a member of the group Click-B. He later debuted as a soloist in September 2006 with the album "Issue" under the stage name "OJ". Oh was a cast member in the variety show "Law of the Jungle" in 2013 and 2014, and appeared in MBC's King of Mask Singer in 2015, under the alias "Lonely Man Leon"   Reinke crystals  Reinke crystals are rod-like cytoplasmic inclusions which can be found in Leydig cells of the testes. Occurring only in adult humans and wild bush rats, their function is unknown. Ovarian stromal tumors having a predominant pattern of fibroma or thecoma but also containing cells typical of steroid hormone-secreting cells were reported. Some of the tumors were classified as luteinized thecomas because the steroid cells resembled lutein cells and lacked crystalloids of Reinke. But others were classified as stromal Leydig cell tumors as seen in tumors of the testes because Reinke crystalloids were identified in the steroid cells. The Stromal Leydig tumors occurred at an average age of 61 years and were associated with Ovarian hyperandrogenism which led to virilization in some cases, endometrial hyperplasia in other cases, and endometrial hyperplasia with carcinoma in the rest of the cases. Luteinized thecomas and stromal Leydig cell tumors are indistinguishable except for the presence of crystalloids of Reinke in the latter. In view of the prolonged search that is necessary to find these structures in some stromal Leydig cell tumors and their well-known absence in the majority of testicular Leydig cell tumors, it is reasonable to assume that an unknown proportion of tumors in the luteinized thecoma category are unrecognized stromal Leydig cell tumors.