Personal communication to FlyBase from Ulrich Nauber, received 08/30/99. Concerning knirps constructs mentioned in Figure 2 of Lunde et al., 1998, Development 125:4145 . In the legend of Figure 2 TWO constructs are mentioned: One is a genomic fragment tested for rescue, the other one is a kni-lacZ reporter construct. Both constructs and the resulting fly stocks were made in the lab of Herbert Jaeckle. The rescue construct consists of a 9.5 kb Sal I / Hind III fragment that contains about 5.5 kb of upstream sequences, the complete kni transcription unit (3 kb) and about 1 kb of downstream sequences. This genomic fragment was inserted into the Carnegie 20 vector and transformed into flies. A map of the construct is published in Pankratz et al., 1992 (Science 255, 986-989). The resulting fly stock is named P(ry+; kni-42) and is available from Herbert Jaeckle. The kni-lacZ reporter construct is a 4.4 kb Bam HI / Nru I upstream fragment of kni fused to the pCaSpeR AUG beta-gal. It is described in detail (with map) in Pankratz et al., 1989 (Nature 341, 337-340) and in Pankratz et al., 1992 (Science 255, 986-989). The fly stock is named P(w+; 4.4knilacZ/2-69) and is available from Herbert Jaeckle. \**************************************************************** Dr. Ulrich Nauber Max-Planck-Institut fuer biophysikalische Chemie Abt. Molekulare Entwicklungsbiologie (Abt. 170) Am Fassberg 11 D-37077 Goettingen \****************************************************************