Mol. Cells 2005; 19(1): 46~53  
Efficient Derivation of New Human Embryonic Stem Cell Lines
Sun Jong Kim, Jeoung Eun Lee, Jong Hyuk Park, Jung Bok Lee, Jin Mee Kim, Byung Sun Yoon, Ji Min Song, Sung Il Roh, Chul Geun Kim, Hyun Soo Yoon
© The Korean Society for Molecular and Cellular Biology. All rights reserved.

ABSTRACT
Human embryonic stem (hES) cells, unlike most cells derived from adult or fetal human tissues, represent a potentially unlimited source of various cell types for basic clinical research. To meet the increased demand for characterized hES cell lines, we established and characterized nine new lines obtained from frozen-thawed pronucleus-stage embryos. In addition, we improved the derivation efficiency from inner cell masses (to 47.4%) and optimized culture conditions for undifferentiated hES cells. After these cell lines had been maintained for over a year in vitro, they were characterized comprehensively for expression of markers of undifferentiated hES cells, karyotype, and in vitro/in vivo differentiation capacity. All of the cell lines were pluripotent, and one cell line was trisomic for chromosome 3. Improved culture techniques for hES cells should make them a good source for diverse applications in regenerative medicine, but further investigation is needed of their basic biology.
Keywords: Derivation Efficiency; Feeder Cell; Human ES Cell; Immunosurgery; Inner Cell Mass; Pluripotency; PN Embryo

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