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This national study compares the social and demographic characteristics of direct and delay entry students in a control group of 1551 students in higher education programmes in 1987 and 1990 with the national study group of 2295 students sampled in 1995. Using a specially constructed socioeconomic variable for comparison the analyses demonstrated a(More)
A cDNA encoding mouse tyrosinase was inserted into a plasmid containing the provirus of a replication competent Avian Leukosis Virus (ALV). A viral stock produced from the plasmid was used to infect cultured tyrosinase-negative (ca/ca) unpigmented chick embryo pigment cells. Five days after infection many cells were producing very dark discrete pigment(More)
Virally introduced mouse tyrosinase expression was checked both in vitro and in vivo in chicken cells and tissues. The results indicate that a constitutive promoter is able to express mouse tyrosinase in a variety of cells and tissues both in vitro and in vivo. Tyrosinase expression is marked by pigment production in situ, which is visible at macroscopic as(More)
This national study compares the social and gender characteristics of an earlier group of 1551 students in higher-education programs in 1987 and 1990 with the national study group of 2295 students sampled in 1995. Using a specially constructed socio-economic variable for comparison, the analyses demonstrated a significant difference in the socio-economic(More)
A cDNA encoding mouse tyrosinase was inserted into a plasmid containing the provirus of a replication competent avian leukosis virus (ALV). A viral stock produced from the plasmid was used to infect cultured tyrosinase-negative (ca/ca) unpigmented chick embryo melanocytes. Five days after infection many cells were producing very dark discrete melanosomes.
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