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Carcinoid tumors are n't the same as other tumors , such as adenocarcinomas ( malignant tumors in cells that produce mucous ) and adenomas ( benign tumors in mucous-producing cells ) . It 's possible that resistant virus could occur in non-sampled cells ; more importantly , virologic results of rechallenge remain to be determined . A strong correlation between Col2a1 and Sox9 expression in chondrogenic cells was seen ( 179 ) . In intermediate Pi concentrations , the PHO pathway is completely activated in some cells , while in other cells the PHO pathway remains inactive . The convergence of lines of longitude at high latitudes results in computational cells that are small relative to those at the equator . He argues that if aberrations increase in white cells , they also increase in other cells including reproductive cells .