In the paper in Development104, 619-630, the following authors’ corrections were inadvertently not included in the printed version:

p. 620 8 lines are duplicated in the first column, second paragraph. It should read\”Such foreign limbs eventually become subjected to chronic rejection in all allotypic combinations carried out so far (Ohki et al. 1987 and unpublished results).”.

p. 622 First column, third paragraph, last sentence should read\”For example, thymic lobes from chickens in which the thymus weighed more than 1·5g …\”.

p. 625 Second column, second paragraph, replace\”on the left side” by\”on one side”.

p. 629 First column, fifth line, delete\”was determined”.

We apologize to the authors for these errors.