P. Countryman

The production of micronuclei from chromosome aberrations in irradiated cultures of human lymphocytes.

J. Heddle, P. Countryman, 1976, Mutation research.

The repair of X-ray induced chromosomal damage in trisomy 2-and normal diploid lymphocytes.

J. Heddle, E. Crawford, P. Countryman, 1977, Cancer research.

The Repair of X-ray-inducedChromosomalDamage in Trisomy21 and Normal DiploidLymphocytes1

E. Crawford, P. Countryman, 1977 .

A true microculture technique for human lymphocytes

J. Heddle, P. Countryman, 1977, Human Genetics.