PMC:1382200 / 24572-24688 JSONTXT

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{"project":"craft-ca-core-dev","denotations":[{"id":"T12333","span":{"begin":85,"end":93},"obj":"CL:0002322"},{"id":"T12332","span":{"begin":37,"end":44},"obj":"UBERON:0000922"}],"text":" In these instances, only a few null embryos are ever observed and homozygous mutant ES cells could not be isolated."}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T12659","span":{"begin":88,"end":93},"obj":"CL_GO_EXT:cell"},{"id":"T12658","span":{"begin":85,"end":93},"obj":"CL:0002322"},{"id":"T12657","span":{"begin":78,"end":84},"obj":"SO_EXT:sequence_altered_entity_or_alteration_process"},{"id":"T12656","span":{"begin":37,"end":44},"obj":"UBERON:0000922"},{"id":"T12655","span":{"begin":32,"end":36},"obj":"SO_EXT:sequence_nullness"}],"text":" In these instances, only a few null embryos are ever observed and homozygous mutant ES cells could not be isolated."}