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NADH.” He waited, studying the globular proteins that formed before him, watching for biologically active molecules. Now! Instinct and training combined to tell him the precise instant. “Two and a half minims of P-450,” he said.
    A corner of turmoil engaged a group of polypeptide chains in the heart of the cell.
    â€œReduce it,” Potter said.
    Svengaard touched the NADH feeder key. He couldn’t
see what Potter saw, but the surgeon’s forehead lens reproduced a slightly off-parallax view of the scope field. That plus Potter’s instructions told of the slow spread of change in the cell.
    â€œKrebs cycle fifty-eight,” the computer nurse said.
    â€œSecond cut,” Potter said.
    â€œArmed,” Svengaard said.
    Potter searched out the myxedema-latent isovaithine, found it. “Give me a tape on structure,” he said. “S- (isopropylcarboxymethyl) cystein.”
    Computer tape hissed through the reels, stopped, resumed at a slow, steady pace. The isovaltine comparison image appeared in the upper right quadrant of Potter’s scope field. He compared the structures, point for point, said, “Tape off.” The comparison image vanished.
    â€œKrebs cycle forty-seven,” the computer nurse said.
    Potter took a deep, trembling breath. Another twenty-seven points and they’d be in the death range. The Durant embryo would succumb.
    He swallowed, aimed off the meson burst.
    Isovalthine tumbled apart.
    â€œReady with cycloserine,” Svengaard said.
    Ahhh, good old Sven, Potter thought. You don’t have to tell him every step of the way what to do.
    â€œComparison on D-4-aminoisoxazolidon-3,” Potter said.
    The computer nurse readied the tape, said, “Comparison ready.”
    The comparison image appeared in Potter’s view field. “Check,” he said. The image vanished. “One point eight minims.” He watched the interaction of the enzymic functional groups as Svengaard administered the cycloserine. The amino group showed a nice, open field of affinity. Transfer-RNA fitted readily into its niches.
    â€œKrebs cycle thirty-eight point six,” the computer nurse said.
    We’ll have to chance it, Potter thought. This embryo won’t take more adjustment.
    â€œReduce vat stasis to half,” he said. “Increase ATP. Give me micro-feed on ten minims of pyruvic acid.”

    â€œReducing stasis,” Svengaard said. And he thought, This will be close . He keyed the ATP and pyruvic acid feeders.
    â€œGive me the Krebs cycle on the half point,” Potter said.
    â€œThirty-five,” the nurse said. “Thirty-four point five. Thirty-four. Thirty-three point five.” Her voice picked up speed with a shocked breathlessness: “Thirty-three … thirty-two … thirty-one … thirty … twenty-nine …”
    â€œRelease all stasis,” Potter said. “Present the full amino spectrum with activated histidine. Start pyridoxin—four point two minims.”
    Svengaard’s hands sped over the keys.
    â€œBack-feed the protein tape,” Potter ordered. “Give it the full DNA record on computer automatic.”
    Tapes hissed through the reels.
    â€œIt’s slowing,” Svengaard said.
    â€œTwenty-two,” the computer nurse said. “Twenty-one nine … twenty-two … twenty-one nine … twenty-two one … twenty-two two … twenty-two one … twenty two two … twenty-two three … twenty-two four … twenty-two three … twenty-two four … twenty-two five … twenty-two six … twenty-two five …
    Potter felt the see-saw battle through every nerve. The morula was down at the edge of the death range. It could live or it could die in the next few minutes. Or it could come out of this crippled. Such things happened. When the flaw was too gross, the vat was turned off, flushed out. But Potter felt an identification with this embryo